CHANGES.md

Release 1.8 (in progress) -- compared to 1.7.x

New minimum dependencies:

• C++11 (gcc 4.8.2, clang 3.3, or MSVS 2013)

Major new features and improvements:

• New oiiotool commands:
  • --info:format=xml format option requests what format the info is printed. Current choices: "text", "xml". #1504 (1.8.0)
  • --info:verbose=1 verbose option make file info print full metadata, but without needing to make other oiiotool operations verbose as would happen with --info -v. #1504 (1.8.0)
• New ImageBufAlgo functions:

Public API changes:

• ImageSpec::serialize() returns a string with a serialized version of the contents of the ImageSpec. It may be text (human readable, like is printed by oiiotool -info -v) or XML. #1504 (1.8.0)

Fixes, minor enhancements, and performance improvements:

• oiiotool:
  • --chappend resolves redundant channel names by using the subimage name, if available. #1498 (1.8.0/1.7.8)
  • --mosaic now gracefully handles the case of not having enough images to completely fill the MxN matrix, with "left over" slots black. #1501 (1.8.0/1.7.8)
• ImageBufAlgo:
  • channel_append() resolves redundant channel names by using the subimage name, if available. #1498 (1.8.0/1.7.8)
• TextureSystem / ImageCache:
  • IC::get_image_info (or TS::get_texture_info) queries for "channels" on UDIM file patterns now succeed, returning the value for the first matching file it finds. (N.B.: Relies on all textures within the same UDIM set having the same nchannels.) #1502, #1519 (1.8.0/1.7.8)
  • maketx: multiple simultaneous maketx process trying to create the same texture will no longer clobber each other's output. #1525 (1.8.0/1.7.8)
• Bug fix to possible crashes when adding dither to tiled file output (buffer size miscalculation). #1518 (1.8.0/1.7.8)

Build/test system improvements:

• Support for building against ffmpeg 3.1 (their API has changed). #1515 (1.8.0/1.7.8)
• Build no longer gets confused about include files from older installations of OIIO elsewhere on the system. #1524 (1.8.0/1.7.8)
• Improvements in finding OpenJPEG. #1520 (1.8.0/1.7.8)

Developer goodies / internals:

Release 1.7 (1 Oct 2016) -- compared to 1.6.x

Major new features and improvements:

• New oiiotool commands:
  • -otex and -oenv allow oiiotool to directly output proper texture maps, and it can now do everything that maketx can do. #1351 (1.7.2)
  • --line can draw polylines into an image. #1319 (1.7.1)
  • --box can draw a filled or unfilled box into an image. #1319 (1.7.1)
  • --laplacian computes the Laplacian. #1332 (1.7.1)
  • --deep_merge does a full merge/composite of deep images. #1388 (1.7.2)
  • -i inputs a file. Options autocc=, now=, info= control aspects of reading that one file. #1389 (1.7.2)
  • --dilate and --erode perform the basic morphological operations of dilation and erosion. #1486 (1.7.5)
• New ImageBufAlgo functions: render_point(), render_line(), render_box() #1319 (1.7.1); laplacian() #1332 (1.7.2); copy() #1388 (1.7.2); deep_merge() #1388,1393 (1.7.2); dilate() and erode() (1.7.5).
• UDIM support for textures: filenames like "tex_<UDIM>.exr" will automatically be resolved to the correct UTIM tile based on the s,t coordinates. #1426 (1.7.3)
• Behavior change: When reading files without explicit channel names, single channel images now name their channel "Y" (no longer "A", which was confusing to algorithms that treat alpha in special ways). Similarly, 2-channel images name their channels "R" and "G". #1434 (1.7.3)

Public API changes:

• DeepData internals and API overhaul: struct internals hidden, now you must use the API; DeepData declaration is now in deepdata.h, not in imageio.h; DD methods now allow insertion and erasure of individual samples. #1289 (1.7.0) New DeepData methods: split, sort, merge_overlaps, merge_deep_pixels, occlusion_cull. #1388,1393 (1.7.2)
• imageio.h: Removed items deprecated since 1.4: a version of convert_types() that took alpha and z channel indices (but never used them). #1291
• fmath.h: Removed safe_sqrtf, safe_acosf, fast_expf, which have been deprecated since 1.5. (1.7.0) #1291
• Removed ImageBufAlgo::flipflop(), which was deprecated since 1.5 and is now called rotate180. #1291 (1.7.0)
• Several varieties of ImageCache and TextureSystem getattribute methods were noticed to not be properly declared 'const'. This was fixed. #1300 (1.7.0/1.6.9)
• For API calls that are deprecated but not yet removed, we now mark them with deprecated attributes for compilers that support it, meaning that you will get compile warnings and explanations when you use deprecated OIIO API functions. #1313,#1318 (1.7.1)
• ImageBuf::contains_roi() reveals whether an ROI is completely contained in the data region of the IB. #1310 (1.7.1)
• TypeDesc::is_signed() return true of the TypeDesc returns a type that can represent negative values. #1320
• Python: improve: reading with request for type UNKNOWN returns native data in an unsigned char array. Also, requesting HALF returns the half bits in an unsigned short array (since there is no 'half' type in Python). #1362 (1.7.2/1.6.11)
• Deprecate ImageCache/TextureSystem clear() methods, which never did anything useful. #1347 (1.7.3)
• ImageSpec::set_format() clears any per-channel format information. #1446 (1.7.4)
• OIIO::getattribute("library_list", ...) can retrieve a list of all the dependent libraries used when OIIO was built. #1458 (1.7.5)
• simd::mask4 class has been renamed simd::bool4 (though the old name is still typedef'ed to work for now). #1484 (1.7.5)
• Python bindings for ImageBuf.reset() now properly understands the argument names and default values. #1492 (1.7.6)

Fixes, minor enhancements, and performance improvements:

• oiiotool:
  • oiiotool --subimage now takes as an argument either the subimage numeric index, or a subimage name. #1287 (1.7.0)
  • oiiotool's image cache was smaller than intended because of typo. (1.7.0/1.6.9)
  • Allow command-line expression metadata names to contain ':'. #1321 (1.7.1/1.6.10)
  • --info more clearly prints info about subimage formats. #1320 (1.7.1)
  • --ch: when the channels were only renamed, not reordered, the renaming didn't happen properly. #1326 (1.7.1/1.6.10)
  • Improved error message propagation from the underlying IBA functions and from errors encounered during --stats. #1338 (1.7.2)
  • --dumpdata:empty=0 now does something for non-deep files: skips reporting of pixels where all channels are black. Also fixed errors for dumpdata of deep, but non-float, files. #1355 (1.7.2/1.6.11)
  • '--attrib:type=t name value' lets you explicitly name the top of the attribute you're seting. This helps for ambiguous cases, and also lets you create aggregate types (such as 'matrix' or 'int[2]' -- the value can be a comma-separated list in those cases). #1351 (1.7.2)
  • --fixnan can now take option "error", meaning that upon finding a NaN, the program considers it an error (rather than fixing). #1351 (1.7.2)
  • -o now takes optional arguments that control the output of just that one file, including :datatype=, :bits=, :dither=, :autocc=, :autocrop=, :autotrim=, :separate=, :contig=. #1351 (1.7.2)
  • --resize and --fit sped up by approximately 2x. #1372 (1.7.2)
  • --runstats not tracks and reports max memory usage. #1385 (1.7.2)
  • New --cache and --autotile options let you set the ImageCache size and autotile options. #1385 (1.7.2)
  • --native results in slightly different behavior: does not force float, but still uses the ImageCache as backing if the native data type is one of the types directly supported by IC. #1385 (1.7.2)
  • --fixnan now works with deep images. #1397 (1.7.3)
  • --stats when used with deep images, if it encounters any nonfinite values, will print the location of a representative one. #1397 (1.7.3)
  • --add, --sub, and --absdiff, when its two image operands have differing number of channels, now try to do the "correct" thing and have the result have the larger number of channels, treating any "missing" channels in either input as if they were 0-valued. #1402 (1.7.3)
  • --attrib:type-timecode lets you set timecodes in "human-readable" form: oiiotool in.exr -attrib:type=timecode TimeCode 11:34:03:00 -o out.exr #1415 (1.7.3)
  • -info -v will print timecodes in human-readable form. #1415 (1.7.3)
  • Bug fix: --fullsize didn't work properly when followed by --attrib. #1418 (1.7.3/1.6.14)
  • Easily understandable warnings for common mistakes: no output specified, an image that's modified but never output, or when -autocc causes output to be a data format that overrides a previous -d directive. #1419 (1.7.3)
  • --origin, --croptofull, and --trim all do their thing to all subimages, if the image at the top of the stack has multiple subimages. #1440 (1.7.3)
  • --crop operates on all subimages if either the -a flag was used, or if the specific optinoal override --crop:allsubimages=1 is used. #1440 (1.7.3)
  • --trim will trim all subimages to the same region, containing the union of all nonzero pixels in all subimages. #1440 (1.7.3)
  • --help now prints all of the dependent libraries for individual formats. #1458 (1.7.5)
  • Bug fix: make sure to propagate per-channel formats from input to output. #1491 (1.7.6)
  • -o:all=n will output all images currently on the stack, and the filename argument will be assumed to be a pattern containing a %d, which will be substituted with the index of the image (beginning with n). For example, to take a multi-image TIFF and extract all the subimages separately, oiiotool multi.tif -sisplit -o:all=1 sub%04d.tif will output the subimges as sub0001.tif, sub0002.tif, and so on. #1494 (1.7.6)
  • --mosaic MxN would fail mysteriously if the number of images on the stack was less then M*N. This has been fixed to handle too-few images gracefully and just leave blank spaces as needed. #1501 (1.7.7)
• ImageBuf:
  • ImageBuf::iterator performance is improved -- roughly cutting in half the overhead of iterating over pixels. #1308 (1.7.1/1.6.10)
  • ImageBuf reads from disk have been improved substantially (in some cases cutting read time in half) in many cases. #1328 (1.7.1)
  • ImageBuf::copy_pixels() has been sped up. #1358 (1.7.2)
• ImageBufAlgo:
  • The varieties of add(), sub(), mul(), and div() that take an image operand and a per-channel constant operand have all been modified to work properly for "deep" images. #1297 (1.7.0/1.6.10)
  • mad() is sped up significantly (10x) for the common case of float images already stored in memory (not cached). #1310 (1.6.1)
  • render_point(), render_line(), render_box() can be used to render points, lines, and boxes into an image. #1319 (1.7.1)
  • channels(): when the channels were only renamed, not reordered, the renaming didn't happen properly. #1326 (1.7.1/1.6.10)
  • computePixelStats: Improved numerical accuracy to avoid getting NaN values from imprecision. #1333 (1.7.2/1.6.11)
  • laplacian() computes the laplacian of an image. #1332 (1.7.2)
  • fixNonFinite() takes a new option: NONFINITE_ERROR, which will return an error if nonfinite values are encountered. #1351 (1.7.2)
  • convolve() and unsharp_mask() have been sped up by about 35% for common cases. #1357 (1.7.2)
  • IBA::resize sped up by approximately 2x. #1372 (1.7.2)
  • IBA::fixNonFinite() now works with deep images. #1397 (1.7.3)
  • dilate() and erode() perform basic morphological operations. #1486 (1.7.5)
• ImageCache / TextureSystem:
  • Less unnecessary pausing after read errors when falure_retries == 0. #1336 (1.7.2/1.6.11)
  • Texture: slight improvement in texture sharpness. #1369 (1.7.2/1.6.11)
  • New statistics related to redundant tile reads. #1417 (1.7.3)
  • TextureSystem option "flip_t", if nonzero, will flip the vertical direction of all texture lookups. Use this for renderers that adhere to the convention that the t=0 texture coordinate is the visible "bottom" of the texture. #1428 (1.7.3) #1462 (1.7.5)
  • UDIM support for textures: filenames like "tex_<UDIM>.exr" will automatically be resolved to the correct UTIM tile based on the s,t coordinates. #1426 (1.7.3)
  • Avoid repeated broken texture error messages. #1423 (1.7.3)
  • New IC/TS attribute: "max_errors_per_file" limits how many error messages are printed for each file. #1423 (1.7.3)
  • Improved statistics: for the "top 3" stats, print the top 3 that aren't broken. Also print a count & list of broken/invalid files. #1433 (1.7.3/1.6.15)
  • Add ability to retrieve various per-file statistics. #1438 (1.7.3/1.6.15)
  • IC will clamp the max_open_files to the maximum allowed by the system, so you can no longer crash a program by incorrectly setting this limit too high. #1457 (1.7.5)
  • IC/TS statistics now report separately the total size of images referenced, in terms of in-cache data size, as well as on-disk size (the latter may be compressed). #1481 (1.7.5)
• maketx:
  • maketx -u now remakes the file if command line arguments or OIIO version changes, even if the files' dates appear to match. #1281 (1.7.0)
  • Remove long-obsolete and non-functional command line options: --new, --old, --hash. #1351 (1.7.2)
• iinfo:
  • More clearly prints info about subimage formats. #1320 (1.7.1)
  • Print timecodes in human-readable form. #1415 (1.7.3)
• ImageOutput: fix cases with native data but non-contiguous strides. #1416 (1.7.3/1.6.15)
• Cineon:
  • Improved deduction/setting of color space info. #1466 (1.7.5)
• GIF:
  • GIF reader failed to set spec full_width, full_height. #1348 (1.7.2/1.6.11)
• JPEG:
  • Fix bad memory access crash when reading specific JPEG files that were written without their comment field including a null character to end the string. #1365 (1.7.2/1.6.11)
  • Change in behavior writing JPEG files when XResolution & YResolution are not provided, but a PixelAspectRatio is requested. Previously, we obeyed the JPEG/JFIF spec exactly, but it turns out that popular apps including PhotoShop and Nuke use the field differently than the spec dictates. So now we conform to how these apps work, rather than to the letter of the spec. #1412 (1.7.3/1.6.15)
• OpenEXR:
  • Fix broken multipart output when parts had different pixel data types. #1306,#1316 (1.7.1/1.6.10)
  • Improved error reporting for bad tile reads. #1338 (1.7.2/1.6.11)
  • Fix errors reading tiles for mixed-format EXR files. #1352 (1.7.2/1.6.11)
  • The global OIIO::attribute("exr_threads") has been modified so that 0 means to use full available hardware, -1 disables the OpenEXR thread pool and execute in the caller thread. #1381 (1.7.2)
  • When writing EXR, double check that there are no repeated channel names, and if so, rename them so the data is not lost (since the underlying libIlmImf will silently drop channels with repeated names). #1435 (1.7.3)
  • More robust detected of when OpenEXR is tiled (for weird files). #1441 (1.7.3/1.6.15) (and a fix in #1448/1.7.4)
  • Fixed minor bug with OpenEXR output with correctly setting PixelAspectRatio based on the "XResolution" and "YResolution" attributes. #1453 (Fixes #1214) (1.7.4/1.6.16)
  • Fix setting "chromaticity" metadata in EXR files. #1487 (1.7.5)
  • When writing OpenEXR, accept compression requests with quality numbers appended to the compression algorithm name, such as "dwaa:200" to mean dwaa compression with a dwaCompressionLevel set to 200. #1493 (1.7.6)
• PNG:
  • Per the PNG spec, name 2-channel images Y,A. #1435 (1.7.3)
  • Enforce that alpha premultiplication on output MUST consider alpha to be the last channel of 2 or 4 channel images, no other cases (as dictated by the PNG spec). #1435 (1.7.3)
• PNM:
  • Fixed byte swapping when reading 16 but PNM files. #1352 (1.7.2/1.6.11)
• RAW:
  • Changes to how we instruct libraw to process images when reading: Now, by default, auto-bright adjustment is off, camera white balance is on, and maximum threshoding is set to 0. There are "open with config" overrides for all of these, for anybody who doesn't like the default. #1490 (1.7.6)
• RLA:
  • Fixes for both reading and writing of RLA images that are cropped (i.e., data window is a subset of display window). #1224 (1.7.0/1.6.10)
• TIFF:
  • When outputting a TIFF file, a special attribute "tiff:half", if set to nonzero, will enable writing of 16-bit float pixel data (obviously, only if the spec.format is HALF). #1283 (1.7.0)
  • TIFF input: erase redundant IPTC:Caption and IPTC:OriginatingProgram if they are identical to existing ImageDescription and Software metadata, respectively. (1.7.0/1.6.9)
  • Output: "tiff:zipquality" attribute controls time-vs-quality for ZIP compression (1-9, defualt 6, higher means more compression). #1295 (1.7.1)
  • Fix typo that made TIFF files incorrectly name color space metadata "oiio::ColorSpace" instead of "oiio:ColorSpace". #1394 (1.7.2)
  • More robust handling of non-zero origin of full/display window. #1414 (1.6.14/1.7.3)
• Video formats:
  • The ffmpeg-based reader had a variety of fixes. #1288 (1.7.0)
  • Support for reading 10-bit and 12-bit movies. #1430 (1.7.5)
• Improved accuracy of "lanczos3" filter; speed up blackman-harris filter. #1379 (1.7.2)
• Speed up linear<->sRGB color conversions (as used by any of the IBA color conversion functions as well as oiiotool --colorconvert and friends), approximately doubling the speed when no OpenColorIO config is found. #1383 (1.7.2)
• ImageInput::create() and ImageOutput::create() will now gracefully handle unexpected exceptions inside an ImageInput or ImageOutput constructor -- return an error rather than crashing. #1456 (1.7.4/1.6.16)
• Nuke txWriter adds UI to let you choose which type of texture you are building (ordinary 2D texture, latlong env map, etc). #1488 (1.7.6)

Build/test system improvements:

• Default build is now C++11! #1344 (1.7.2) You can still (for now) build for C++03 using 'make USE_CPP11=0' or 'cmake -DOIIO_BUID_CPP11=0', but some time soon we will be C++11 minimum.
• Fix build break against Boost 1.60. #1299,#1300 (1.7.0/1.6.9/1.5.23)
• filesystem_test now much more comprehensively tests the contents of Filesystem. #1302 (1.7.0)
• fmath_test adds benchmarks for various data conversions. #1305 (1.7.0)
• Travis: add DEBUG builds to the matrix to fix any warnings or failures that only show up for DEBUG builds. #1309 (1.7.1/1.6.10)
• Fix build issues on some platforms for SHA1.h, by adding proper include of <climits>. #1298,#1311,#1312 (1.7.1/1.6.10)
• Cleanup of include logic in simd.h that fixed build problems for gcc < 4.4. #1314 (1.7.1/1.6.10)
• Fix build breaks for certain 32 bit platforms. #1315,#1322 (1.7.1/1.6.10)
• imagespeed_test can not specify the data conversion type for reads, can optionally allow skipping the IB iteration tests, and can set the IC tile cache size. #1323 (1.7.1)
• Fix build breaks for gcc 6. #1339 (1.7.2/1.6.11) #1436 (1.7.3/1.6.15)
• Fix errors in finding the correct locaiton of pugixml.hpp when using USE_EXTERNAL_PUGIXML=1. #1339 (1.7.2/1.6.11)
• Rewrite of FindOpenEXR.cmake. Solves many problems and is simpler. No more FindIlmbase.cmake at all. #1346 (1.7.2/1.6.11)
• 'make CODECOV=1; make CODECOV=1 test' can build and test in a way that provides a code coverage report. #1356 (1.7.2)
• Fix Filesystem::open() issues with UTF-8 filenames on MinGW. #1353,#1357 (1.7.2/1.6.11)
• Allow build against a wider range of ffmpeg versions. #1359 (1.7.2)
• Build correctly against FFMPEG 3.0. #1374 (1.7.2)
• If found, libjpeg-turbo is used rather than libjpeg; this gives about a 2x speed improvement for reading & writing JPEG files. #1390 (1.7.2/1.6.13)
• USE_CPP11=... and USE_CPP14=... are the build flags for both the Make wrapper and the CMake scripts. (Before, it was confusing to have USE_CPP11 for make but OIIO_BUILD_CPP11 for CMake. Now they are one.) #1391 (1.7.2)
• Improved LINKSTATIC=1, now mostly works. #1395 (1.7.3)
• Big CMake refactor, got rid of redundancies. #1395 (1.7.3)
• Remove old embedded Ptex, now must find Ptex externally. Also modified the build scripts to correctly handle newer versions of Ptex. #1400 (1.7.3/1.6.13)
• Got Appveyor building OIIO. This is a continuous integration service much like Travis, but it's for Windows. Hopefully this means that it will be much harder for us to make changes that inadvertently break the build on Windows. #1399 (1.7.3)
• Make FindOpenEXR.cmake more robust when the version number is embedded in the library name. #1401 (1.7.3/1.6.15)
• Clear up some inconsistencies in the CMake files and the Makefile wrapper: the flag to compile with libc++ is now always called USE_LIBCPLUSPLUS, not sometimes OIIO_BUILD_LIBCPLUSPLUS. #1404 (1.7.3)
• Overhaul OpenCV dependency finding and make it work with OpenCV 3.x. #1409 (1.7.3/1.6.13)
• Allow custom JPEG_PATH to hint location of JPEG library. #1411 (1.7.3/1.6.13)
• Windows UTF-8 filename safety fixes. #1420 (1.7.3/1.6.14)
• Various Windows compilation & warning fixes. #1443 (1.7.3/1.6.15)
• Now builds correctly against OpenJPEG 2.x, it previously only supported OpenJPEG 1.x. #1452 (Fixes #957, #1449) (1.7.4/1.6.16)
• Fix Filesystem::searchpath_find on Windows with UTF-8 paths. #1469 (1.7.51.6.17)
• Improved the way OpenEXR installations are found. #1464 (1.7.5)

Developer goodies / internals:

• thread.h has had all the atomic operations split into a separate atomic.h. #1443 (1.7.3)
• atomic.h: add atomic and, or, and xor. #1417 (1.7.2/1.6.14);
• parallel_image has been improved in several ways: can choose split direction; raised minimum chunk size to prevent thread fan-out for images too small to benefit; uses the calling thread as part of the pool. #1303 (1.7.0)
• timer.h: DoNotOptimize() and clobber_all_memory() help to disable certain optimizations that would interfere with micro-benchmarks. #1305 (1.7.0)
• simd.h improvements: select(); round(); float4::store(half*), int4::store(unsigned short*), int4::store(unsigned char*). #1305 (1.7.0) Define insert, extract, and ^ (xor), and ~ (bit complement) for mask4, and add ~ for int4. #1331 (1.7.2); madd, msub, nmadd, nmsub, rint, andnot #1377 (1.7.2); exp, log #1384 (1.7.2); simd::float3 is like float4, but only loads and stores 3 components, it's a good Vec3f replacement (but padded) #1473 (1.7.5); matrix44 4x4 matrix class #1473 (1.7.5); mask4 renamed to bool4, and addition of float8, int8, bool8 classes for 8-wide AVX/AVX2 SIMD #1484 (1.7.5).
• fmath.h: convert_types has new special cases that vastly speed up float <-> uint16, uint8, and half buffer conversions #1305 (1.7.0); ifloor (1.7.2); SIMD versions of fast_log2, fast_log, fast_exp2, fast_exp, fast_pow_pos #1384 (1.7.2); fix sign of expm1 for small arguments #1482 (1.7.5); added fast_log1p #1483 (1.75).
• Fix pesky precision discrepancy in internal convert_type<> that used slightly different math when converting one value at a time, versus converting whole arrays. #1350 (1.7.2)
• thread.h: add mutex_pool #1425 (1.7.3/1.6.15)
• compute_test: new unit test can be used to benchmark computation times. #1310 (1.7.1)
• filesystem.h: Filesystem::file_size() returns file size in bytes; Filesystem::read_bytes() reads the first n (or all) bytes from a file into a buffer. #1451 (1.7.4/1.6.16)
• strutil.h: Strutil::extract_from_list_string is more flixible by allowing the vals list to start empty, in which case it will add as many values as it finds rather than only replacing existing values #1319 (1.7.1); Strutil::replace #1422 (1.7.3/1.6.15); utf_to_unicode now takes a string_view rather than a std::string& #1450 (1.7.4); add Strutil::base64_encode() #1450 (1.7.4).
• sysutil.h: Sysutil::getenv() safely gets an env variable as a string_view #1451 (1.7.4/1.6.16); terminal_columns() now has a correct implementation on Windows #1460 (1.7.5); max_open_files() retrieves the maximum number of files the process may open simultaneously #1457 (1.7.5).
• platform.h: better distinguishing beteen Apple and Generic clang, separately set OIIO_CLANG_VERSION and OIIO_APPLE_CLANG_VERSION. Also change OIIO_GNUC_VERSION to 0 for clang, only nonzero for true gcc. #1380 (1.7.2)
• ImageCache: remove unused shadow matrix fields, save space. #1424 (1.7.3)
• Many documentation files (such as README, CHANGES, LICENSE, CREDITS, and INSTALL) have been changed from plain text to MarkDown. #1442 (1.7.3)
• Sysutil::Term class makes it easy to use color output on the terminal. #1479 (1.7.5)

Release 1.6.17 (released 1 Sep 2016 -- compared to 1.6.16)

• Fix build for newer ffmpeg release that deprecated functions.
• Improved finding of OCIO installations. #1467
• Fixed Sysutil::terminal_columns() for WIndows. #1640
• Fix build break in Windows when roundf function not found. #1468
• Fix Filesystem::searchpath_find on Windows with UTF-8 paths. #1469

Release 1.6.16 (released 1 Aug 2016 -- compared to 1.6.15)

• Fix EXR tile logic for OpenEXR 1.x (fixes a break introduced in 1.6.15, is not an issue for exr 2.x). #1448
• Now builds correctly against OpenJPEG 2.x, it previously only supported OpenJPEG 1.x. #1452 (Fixes #957, #1449)
• New utility functions: Sysutil::getenv(), Filesystem::file_size(), FileSystem::read_bytes(). #1451
• Fixed minor bug with OpenEXR output with correctly setting PixelAspectRatio based on the "XResolution" and "YResolution" attributes. #1453 (Fixes #1214)
• Gracefully handle unexpected exceptions inside an ImageInput or ImageOutput constructor -- return an error rather than crashing. #1456

Release 1.6.15 (released 1 Jul 2016 -- compared to 1.6.14)

• Improved statistics: for the "top 3" stats, print the top 3 that aren't broken. Also print a count & list of broken/invalid files. #1433
• Change in behavior writing JPEG files when XResolution & YResolution are not provided, but a PixelAspectRatio is requested. Previously, we obeyed the JPEG/JFIF spec exactly, but it turns out that popular apps including PhotoShop and Nuke use the field differently than the spec dictates. So now we conform to how these apps work, rather than to the letter of the spec. #1412
• IC/TS: add ability to retrieve various per-file statistics. #1438
• Windows UTF-8 filename safety fixes. #1420
• ImageOutput: fix cases with native data but non-contiguous strides. #1416
• Make FindOpenEXR.cmake more robust when the version number is embedded in the library name. #1401
• Fix build breaks for gcc 6. #1339 (1.7.2/1.6.11) #1436
• More robust detected of when OpenEXR is tiled (for weird files). #1441
• Various Windows compilation and warning fixes.
• strutil.h: added replace(). #1422
• thread.h: added mutex_pool. #1425

Release 1.6.14 (released 1 Jun 2016 -- compared to 1.6.13)

• More robust handling of TIFF I/O when non-zero origin of full/display window. (#1414)
• oiiotool --fullsize didn't work properly when followed by --attrib. (#1418)

Release 1.6.13 (released 1 May 2016 -- compared to 1.6.12)

• Use libjpeg-turbo if found. It's a drop-in replacement for libjpeg, but is around 2x faster. #1390
• Fix some Windows compiler warnings and errors.
• Remove old embedded Ptex, now must find Ptex externally. Also modified the build scripts to correctly handle newer versions of Ptex. #1400
• Overhaul OpenCV dependency finding and make it work with OpenCV 3.x. #1409
• Allow custom JPEG_PATH to hint location of JPEG library. #1411

Release 1.6.12 (released 1 Apr 2016 -- compared to 1.6.11)

• Build correctly against FFMPEG 3.0. #1374
• The global OIIO::attribute("exr_threads") has been modified so that 0 means to use full available hardware, -1 disables the OpenEXR thread pool and execute in the caller thread. #1381
• Thread-pool counts initialized to hardware_concurrency, not physical_concurrency (i.e., they will include hyperthread cores by default). #1378
• oiiotool --autocc bug fixed.
• Miscellaneous improvements to simd.h ported from master.
• Fix typo that made TIFF files incorrectly name color space metadata "oiio::ColorSpace" instead of "oiio:ColorSpace". #1394

Release 1.6.11 (released 1 Mar 2016 -- compared to 1.6.10)

• Fix potential of IBA::computePixelStats (including oiiotool --stats) to end up with NaNs due to numerical imprecision. #1333
• Less unnecessary pausing after read errors when falure_retries == 0. #1336
• Fix errors in finding the correct locaiton of pugixml.hpp when using USE_EXTERNAL_PUGIXML=1. #1339
• Fix build breaks for gcc 6. #1339
• GIF reader failed to set spec full_width, full_height. #1348
• PNM: Fixed byte swapping when reading 16 but PNM files. #1352
• OpenEXR: Improved error reporting for bad tile reads. #1338
• OpenEXR: Fix errors reading tiles for mixed-format EXR files. #1352
• oiiotool --dumpdata:empty=0 now does something for non-deep files: skips reporting of pixels where all channels are black. Also fixed errors for dumpdata of deep, but non-float, files. #1355
• Fix Filesystem::open() issues with UTF-8 filenames on MinGW. #1353
• Rewrite of FindOpenEXR.cmake. Solves many problems and is simpler. No more FindIlmbase.cmake at all. #1346
• Fix build break for older gcc < 4.4 that didn't have immintrin.h.
• Fix bad memory access crash when reading specific JPEG files that were written without their comment field including a null character to end the string. #1365
• The ffmpeg-based reader had a variety of fixes. #1288
• Python: improve: reading with request for type UNKNOWN returns native data in an unsigned char array. Also, requesting HALF returns the half bits in an unsigned short array (since there is no 'half' type in Python). #1362
• Texture: slight improvement in texture sharpness. #1369
• Update webp testsuite references for new webp version.

Release 1.6.10 (released 1 Feb 2016 -- compared to 1.6.9)

• ImageBufAlgo add, sub, mul, and div, for the varieties that combine an image with a (per-channel) constant, now work for "deep" images. #1257
• ImageBuf::iterator performance is improved -- roughly cutting in half the overhead of iterating over pixels. #1308
• OpenEXR: Fix broken multipart output when parts had different pixel data types. #1306,#1316
• Allow oiiotool command-line expression metadata names to contain ':'.
• Fix oiiotool --ch (or IBA::channels) when the channels were only renamed, not reordered, the renaming didn't happen properly. #1326
• Fixes for both reading and writing of RLA images that are cropped (i.e., data window is a subset of display window). #1224
• Fix build issues on some platforms for SHA1.h, by adding proper include of <climits>. #1298,#1311,#1312
• Cleanup of include logic in simd.h that fixed build problems for gcc < 4.4. #1314
• Fix build breaks for certain 32 bit platforms. #1315,#1322

Release 1.6.9 (released 5 Jan 2016 -- compared to 1.6.8)

• Several varieties of ImageCache and TextureSystem getattribute methods were noticed to not be properly declared 'const'. This was fixed. #1300 (1.6.9)
• Fix build break against Boost 1.60. #1299,#1300 (1.6.9/1.5.23)
• The Python bindings for ImageCache was overhauled after several of the methods were found to be horribly broken. #1300 (1.6.9)
• oiiotool --subimage now allows a subimage name as argument, as well as the numeric index. #1271,#1287 (1.6.9)
• TIFF input: erase redundant IPTC:Caption and IPTC:OriginatingProgram if they are identical to existing ImageDescription and Software metadata, respectively. (1.6.9)
• Fix oiiotool image cache smaller than intended because of typo. (1.6.9)

Release 1.6 (1.6.8 released Dec 21, 2015 -- compared to 1.5.x)

Major new features and improvements:

• New oiiotool functionality:
  • Expression evaluation/substitution on the oiiotool command line. Anything enclosed in braces { } in a command line argument will be substituted by the evaluation of the enclosed expression. Expressions may be numbers, simple arithmetic (like 'expr+expr'), or retrieving image metadata from named images or images on the stack. Please see the PDF documentation, Section 12.1 for details and examples.
  • --absdiff, --absdiffc compute the absolute difference (abs(A-B)) of two images, or between an image and a constant color. #1029 (1.6.0)
  • --abs computes the absolute value of an image. #1029 (1.6.0)
  • --div, divc divide one image by another (pixel by pixel), or divides the pixels of an image by a constant color. #1029 (1.6.0)
  • --addc, --subc, --mulc, --powc are the new names for --cadd, --csub, --cmul, and --cpow. The old ones will continue to work but are considered depcrected. #1030 (1.6.0)
  • --pattern supports new patterns: "fill" makes a solid, vertical or horizontal gradient, or four-corner interpolated image (just like the --fill commmand) (1.6.0); "noise" can generate uniform, gaussian, or salt & pepper noise (1.6.2).
  • --fill, in addition to taking optional parameter color=... to give a solid color for the fill region, now also takes top=...:bottom=... to make a vertical gradient, left=...:right=... to make a horizontal gradient, and topleft=...:topright=...:bottomleft=...:bottomright=... to make a 4-corner gradient. (1.6.0)
  • --noise adds noise to the current image: additive uniform or gaussian noise, or making "salt & pepper" noise. (1.6.2)
  • --trim crops the image to the minimal rectangle containing all the non-0 pixels. (1.6.3)
  • --autocc : when turned on, automatic color conversion of input files into a scene_linear space, and conversion to an appropriate space and pixel type upon output. It infers the color spaces based on metadata and filenames (looking for OCIO-recognized color space names as substrings of the filenames). #1120 (1.6.3)
  • --mad takes three image arguments, multiplies the first two and then adds the third to it. #1125 (1.6.3)
  • --invert computes the color inverse (1-value) for color channels. #1125 (1.6.3)
  • --colorconfig allows you to specify a custom OCIO configuration file (rather than strictly relying on the $OCIO env variable). #1129 (1.6.3)
  • --deepen converts flat images to "deep". #1130 (1.6.3)
  • -n (no saved output) performs all calculations (including timing and stats) but does not write any output files to disk. #1134 (1.6.3)
  • --debug prints debugging information, this is now separate from -v which just makes more verbose (non-debugging) output. #1134 (1.6.3)
  • --pixelaspect rescales the image to have the given pixel aspect ratio. #1146 (1.6.5)
  • --ociofiletransform() implements OpenColorIO "file" transforms. #1213 (1.6.5)
• New ImageBufAlgo functions:
  • absdiff() computes the absolute difference (abs(A-B)) of two images, or between an image and a constant color. #1029 (1.6.0)
  • abs() computes the absolute value of an image. #1029 (1.6.0)
  • div() divides one image by another (pixel by pixel), or divides all the pixels of an image by a constant color. #1029 (1.6.0)
  • fill() has been extended with new varieties that take 2 colors (making a vertical gradient) and 4 colors (one for each ROI corner, for a bilinearly interpolated gradient). (1.6.0)
  • noise() injects noise into an image -- uniform, gaussian/normal, or salt & pepper noise. (1.6.2)
  • mad() multiplies the first two arguments and then adds the third to it. #1125 (1.6.3)
  • invert() computes 1-val. #1125 (1.6.3)
  • deepen() turns a flat RGBA (and optional Z) image into a "deep" image. #1130 (1.6.3)
  • ociofiletransform() implements OpenColorIO "file" transforms. #1213 (1.6.5)
• Some open source fonts are now distributed with OIIO (DroidSans, DroidSans-Bold, DroidSerif, DroidSerif-Bold, DroidSerif-Italic, DroidSerif-BoldItalic, and DroidSansMono), and so those are always available to ImageBufAlgo::render_text() and oiiotool --text, on all platforms and even if you don't have any other installed fonts on your system. DroidSans is now the default font. #1132 (1.6.3)
• GIF output support (including writing animated GIF images, just write it as a multi-subimage file). For example, this works: oiiotool foo*.jpg -siappendall -attrib FramesPerSecond 10.0 -o anim.gif #1193 (1.6.4)

Public API changes:

• TypeDesc:
  • New helper methods: is_array(), is_unsized_array(), is_sized_array(). #1136 (1.6.3)
  • New constructor and fromstring of a string_view, in addition to the old versions that took char*. #1159 (1.6.4/1.5.16)
  • New aggregate type: MATRIX33. #1265,#1267 (1.6.6)
• ImageSpec:
  • ImageSpec::metadata_val() is now static, rather than simply const, since it doesn't need access to *this at all. #1063 (1.6.1)
  • Added a new variety of find_attribute that takes a temporary ImageIOParameter as scratch space. The advantage of this call is that it can retrieve items from the named ImageSpec fields, such as "width", "full_x", etc. Also, the get_int_attribute, get_float_attribute, and get_string_attribute can now retrieve these fixed fields as well. #1063 (1.6.1)
• ImageInput & ImageOutput:
  • New ImageOutput::supports() tags: supports("alpha") should be true for image formats that support an alpha channel, supports("nchannels") should be true for output formats that support an arbitrary number of output channels. (1.6.2/1.5.13)
  • ImageInput and ImageOutput supports() method has been changed to accept a string_view (rather than a const std::string&), and return an int (rather than a bool). (1.6.2)
  • ImageInput and ImageOutput have added destroy() static methods. They are just wrappers around 'delete', but can help you to ensure that II and IO objects are deleted on the same side of a DLL boundary as where they were created. (Helps with using OIIO from DLL-based plugins on Windows.) (1.6.3)
  • New ImageInput query: "procedural" -- returns 1 if the ImageInput may not correspond to an actual file. #1154 (1.6.4/1.5.16)
  • ImageInput and ImageOutput's error() method is changed from protected to public, making it easier for an app to set an error on a reader or writer. (1.6.4)
  • ImageOutput::copy_to_image_buffer is a helper function that generalizes the existing copy_tile_to_image_buffer, but for any rectangle. #1193 (1.6.4)
  • ImageInput::read_image() variant that takes a channel range to read just a subset of the channels present. #1222 (1.6.5)
  • ImageInput and ImageOutput now have new method threads(n) that sets the thread "fan-out" for the ImageInput or ImageOutput individually, overriding any global attribute("threads"). #1259 (1.6.6)
• ImageBuf:
  • Add make_writeable(), which forces ImageCache-backed read-only ImageBuf to read into locally allocated pixels so they can be subsequently altered. #1087 (1.6.2)
  • ImageBuf::Iterator has added set_deep_samples() and set_deep_value() methods. (1.6.3)
  • ImageBuf::set_pixels() now provides a way to set an arbitrary rectancle of an ImageBuf from raw values. #1167 (1.6.4)
  • ImageBuf::get_pixels() now has a variety that takes an ROI to describe the rectangle of pixels being requested. #1167 (1.6.4)
  • ImageBuf now has new method threads(n) that sets the thread "fan-out" for the ImageInput or ImageOutput individually, overriding any global attribute("threads"). #1259 (1.6.6)
• ImageCache/TextureSystem:
  • Clarified in the docs that TextureSystem::get_texture_info and ImageCache::get_image_info "exists" queries should return true, and place in *data the value 1 or 0 depending on whether the image exists and can be read. (1.6.0/1.5.10)
  • Added handle-based versions of TextureSystem get_texture_info(), get_imagespec(), imagespec(), and get_texels(), in addition to the existing name-based versions of those methods. Note that texture(), environment(), and texture3d() already had both name-based and handle-based varieties. #1057 (1.6.1) #1083 (1.6.2)
  • Add create_thread_info() and destroy_thread_info() methods that allow an app to manage the per-thread records needed by the IC. #1080 (1.6.2)
  • Added ImageCache get_perthread_info() and get_image_handle() to return opaque perthread and file handle pointers, much like TextureSystem already had, and added handle-based versions of get_image_info(), get_imagespec(), imagespec(), get_pixels(), and get_tile(), in addition to the existing name-based versions of those methods. #1057 (1.6.1)
  • ImageCache get_tile and get_pixels have new varieties that let you request channel begin/end range. This allows you to control which channel ranges are in the cache, and thus be much more efficient with cache storage when only a few channels are needed from a file with many channels. #1226 (1.6.5)
• ImageBufAlgo:
  • New ImageBufAlgo functions: abs, absdiff, div, fill, noise, mad, invert, deepen, ociofiletransform.
  • nchannels() now takes an 'nthreads' parameters, just like all the other ImageBufAlgo functions. #1261 (1.6.6)
• Python bindings:
  • Added previously-M.I.A. ImageSpec::erase_attribute(). #1063 (1.6.1)
  • ImageSpec.set_channel_formats() now works when the channel type lists are either TypeDesc, in addition to the existing support for BASETYPE. #1113 (1.6.3/1.5.13)
  • Added Python bindings for DeepData and deep reads (ImageInput) and writes (ImageOutput), as well as additional DeepData and ImageBuf methods to fully match the C++ API. #1113 #1122 (1.6.3/1.5.13)
  • ImageBuf.set_pixels, and ImageBuf.get_pixels with ROI. #1167,1179 (1.6.4)
  • Change Python ImageOutput bindings to simplify the write_* methods. They no longer take both a TypeDesc and an array; it can figure out the type from the array itself. Also get rid of the stride parameters, which weren't useful in a Python context. #1184 (1.6.4)
  • ImageBufAlgo colorconvert, ociolook, and ociodisplay now take an optional string colorconfig argument. #1187 (1.6.4)
  • Fix missing Python bindings for global OIIO::getattribute(). #1290 (1.6.8)
• The ColorConfig wrapper for OCIO functionality has been extended to parse color names from filename strings, and to report the recommended pixel data type for a color space. #1129 (1.6.3)
• C++11 definitions: oiioversion.h defines OIIO_BUILD_CPP11 as nonzero if OIIO itself was built in C++11 (or later) mode, and platform.h defines OIIO_USING_CPP11 as nonzero if at this moment C++11 (or later) mode is detected. Note that these can differ if one set of compiler flags was used to build OIIO, and a different set is used to build a project that uses OIIO headers. #1148 (1.6.4)
• Renamed the "fps" standard metadata to "FramesPerSecond. #1193 (1.6.4)
• Removed deprecated header "string_ref.h" (use string_view.h). (1.6.1)
• oiioversion.h: Renamed the namespace macros OIIO_NAMESPACE_ENTER/EXIT to OIIO_NAMESPACE_BEGIN/END, and roll the braces into it. #1196 (1.6.4)
• array_view.h: Refactor array_view to be more in line with what is slated for C++17, in particular it is now templated on Rank and so can be a view to a multi-dimensional array. Also change array_view_strided to have strides measured in units of sizeof(T), not bytes (to keep with C++17). This also adds coordinate.h to give definitions for the offset<>, bounds<>, and bounds_iterator<> templates used by array_view. #1205 (1.6.4)
• Add top-level OIIO::get_int_attribute(), get_float_attribute(), and get_string_attribute() helpers, similar to how they work in many of the classes. #1283 (1.6.7)

Fixes, minor enhancements, and performance improvements:

• oiiotool
  • Bug fix for frame sequences -- could crash in Windows. #1060 (1.6.1)
  • Gracefully handle requests to save an image with more channels than the output file format can handle. Instead of being a fatal error, now it's just a warning, and extra channels are dropped. It tries to to find R, G, B, and A channels, saving them. If those names are not found, it just saves the first 3 (or 4) channels. #1058 (1.6.1)
  • Improve error messages when files can't be read. It is now easier to to distinguish files that don't exist from those that are an unknown format from those that are corrupted or have read errors. #1065 (1.6.1)
  • Flag errors properly when -d specifies an unknown data format name. #1077 (1.6.2/1.5.13)
  • oiiotool numeric wildcard improvement: allow more digits to match. #1082 (1.6.2/1.5.13)
  • Bug fix: input file data format didn't always end up in the output. (1.6.3)
  • --channels bugs were fixed when dealing with "deep" images. (1.6.3)
  • All the color space conversion operations run much faster now, since the underlying IBA::colorconvert() has been parallelized. (1.6.3)
  • --crop logic bug fixed in cases where the crop region was the same size as the original pixel data window. #1128 (1.6.3)
  • oiiotool now gives proper error messages when asked to perform unsupported operations on deep images. (1.6.3)
  • Bug fix: --frames incorrectly overrode explicit frame sequence wildcards on the command line. #1133 (1.6.3)
  • --crop, --trim, and --autotrim have been extended to work on "deep" images. #1137 (1.6.3)
  • For "procedural" ImageInputs, don't give "file doesn't exist" errors. (1.6.4)
  • Suppress output/copying of "textureformat" metadata inherited from input if it's not plausibly still a valid texture (i.e., if it's no longer tiled or MIPmapped). #1206 (1.6.4)
  • oiiotool's full help message lists all supported formats. #1210 (1.6.5)
  • oiiotool --help prints a briefer help screen. Use --help -v for the full-detail help. #1214 (1.6.5)
  • Bug fix in --fit when the image didn't need to be resized. #1227 (1.6.5/1.5.21)
  • Bug fix in --ch for "deep" files when the channel reordering is the same as it already was. #1286 (1.6.7)
• ImageBufAlgo:
  • compare() (and therefore oiiotool -diff and idiff) did not notice image differences when the pixels that differed had NaN or NaN or Inf values! Now it is right. #1109 (1.6.3/1.5.13)
  • channels() bugs were fixed when dealing with "deep" images. (1.6.3)
  • colorconvert() has been parallelized, and thus on most systems will now run much faster. (1.6.3)
  • render_text() handles UTF-8 input. #1121 (1.6.3)
  • colorconvert(), ociodisplay(), and ociolook() have new varities that accept an optional ColorConfig, rather than having no choice but to construct a new one internally. (1.6.3)
  • nonempty_region() and crop() have been extended to handle "deep" images. #1137 (1.6.3)
  • Fix bug in fft() -- was not always zeroing out the imaginary channel. #1171 (1.6.4/1.5.17)
  • Fixed uninitialized variable bugs with rangecompress() and rangeexpand() when using luma. #1180 (1.6.4)
  • The lanczos3, radial-lanczos, and catrom filters have been change from fixed-width to fully scalable. This fixes artifacts that occur when using them as upsizing filters. #1228,#1232 (1.6.5/1.5.21)
• maketx, TextureSystem, and ImageCache:
  • TextureSystem/IC now directly stores uint16 and half pixel data in the cache rather than converting internally to float for tile storage, thus effectively doubling the cache capacity for files of those formats. (1.6.3)
  • Fix broken bicubic texture sampling with non-power-of-two sized tiles. #1035 (1.6.0/1.5.10)
  • maketx: when the source image was a crop (data window != display window), and the sharpening filters were used, it would incorrectly issue an "unknown filter name" error. #1059 (1.6.1/1.5.12)
  • maketx: Flag errors properly when -d specifies an unknown data format name. #1077 (1.5.13)
  • maketx now writes to a temporary file, then moving it to the final requested output filename only when the write completed without error. This prevents situations where maketx crashes or is killed and leaves behind a file that looks correct but is actually corrupted or truncated. #1072 (1.6.2/1.5.13)
  • TextureSystem bug fix that occasionally resulted in NaN in the alpha channel result when looking up from 3-channel images. #1108 (1.6.3/1.5.13)
  • maketx --runstats prints runtime staticstics (deprecating --stats). #1152 (1.6.4)
  • Fixed trilinear MIPmap texture lookups that gave invalid alpha fill. #1163 (1.6.4/1.5.16)
  • The lanczos3, radial-lanczos, and catrom filters have been change from fixed-width to fully scalable. This fixes artifacts that occur when using them as upsizing filters. #1228,#1232 (1.6.5)
  • Texture cache memory efficiency is much better for the special case of accessing just a few channels from a texture file with large numbers of channels. #1226 (1.6.5)
  • Eliminate spurious ImageCache invalidation just because the shared cache is requested again. #1157 (1.6.4/1.5.16)
  • Statistics output also shows all the option setting values. #1226 (1.6.5)
  • Data copy error in ImageCache::get_pixels for partial-channel-set copies. #1246 (1.6.5)
  • maketx -u now remakes the file if command line arguments or OIIO version changes, even if the files' dates appear to match. #1281 (1.6.8)
• GIF:
  • Write support! #1193 (1.6.4)
  • On input, renamed "fps" metadata to "FramesPerSecond". #1193 (1.6.4)
• IFF:
  • Fix botched output of 16 bit uncompressed data. #1234 (1.6.5/1.5.21)
  • Make "rle" compression the default. #1234 (1.6.5/1.5.21)
• JPEG:
  • Now properly read/write xdensity and ydensity (what OIIO and TIFF call "XResolution" and "YResolution" and, therefore, "PixelAspectRatio". #1042 #1066 (1.6.0, 1.6.1)
  • Support JPEG files encoded as CMYK (by converting to RGB upon read) #1044 (1.6.1)
  • Fix misdeclared supports() which would make the JPEG plugin appear to not support exif or iptc. #1192 (1.6.4)
• JPEG-2000:
  • Fix handling of un-premultiplied alpha (which is dictated by the JPEG-2000 spec). (1.6.3)
  • Fix reading of YUV-encoded files. (1.6.3)
  • Read and write the ICC profile, if present. (1.6.3)
  • Handle all bit depth precisions properly (previously only 8, 10, 12, and 16 were right). (1.6.3)
  • Set the full/display window correctly. (1.6.3)
  • Deal with differing per-channel data windows and sampling rates. (1.6.3)
• OpenEXR:
  • Improved handling of density and aspect ratio. #1042 (1.6.0)
  • Fix read_deep_tiles() error when not starting at the image origin. #1040 (1.6.0/1.5.10)
  • Fix output of multi-part exr file when some parts are tiled and others aren't. #1040 (1.6.0/1.5.10)
  • write_tile() with AutoStride calculated the wrong default strides for "edge" tiles when the image width or length was not an integer multiple of the tile size. Also clarified the PDF and imageio.h docs in how they explain strides for this case. #1055 (1.6.1/1.5.12)
  • Fix bugs in reading deep OpenEXR images with mixed channel types. #1113 (1.6.3/1.5.13)
  • OpenEXR output supports("deepdata") now correctly returns 'true'. #1238 (1.6.5/1.5.21)
  • A separate global OIIO::attribute("exr_threads") sets the thread pool size for OpenEXR's libIlmImf, independent of the OIIO thread fan-out attribute OIIO::attribute("threads"). #1244 (1.6.5)
  • Correctly read and write Matrix33 and double (scalar, 2d, 3d, m33, m44) metadata. #1265,#1267 (1.6.6)
  • Recognize AR/AG/AB channel names in addition to the old RA/RG/RB #1277 (1.6.6)
• PNG:
  • Writing PNG files now honors the PixelAspectRatio metadata. #1142 (1.6.3)
• PFM:
  • PFM (float extension of PNM) was incorrectly flipped top to bottom. Now fixed. #1230 (1.6.5)
• PSD:
  • Better error handling for files lacking "global layer mask info" or "additional layer info". #1147 (1.6.4/1.5.18)
  • Additional PSD signatures for global additional layer info. #1147 (1.6.4/1.5.18)
  • Better error handling when dealing with an empty layer mask. #1147 (1.6.4/1.5.18)
• TIFF:
  • Improved handling of density and aspect ratio. #1042 (1.6.0)
  • Improved proper handling of the interplay between "XResolution", "YResolution", and "PixelAspectRatio". #1042 (1.6.0)
  • TIFF output: recognize special "tiff:write_exif" metadata, which when present and set to 0, will skip writing the Exif directory into the TIFF file. This can be helpful when you expect the resulting TIFF file to be read with very old versions of libtiff. #1185 (1.6.4/1.5.18)
  • Correct read and write of JPEG-compressed TIFF. #1207 (1.6.4)
  • Correct support for reading LAB, LOG, YCbCr, subsampled chroma. #1207 (1.6.4)
  • Make robust to strange TIFF files that have unexpected MIP level-to-MIP level changes in planarconfig, photometric, palette, extrasamples, etc. #1220,1221 (1.6.5/1.5.20)
  • Support output of 2, 4, 10, and 12 bit unsigned ints into TIFF files. #1216 (1.6.5)
  • Make TIFF reading more robust to certain subimage-to-subimage changes that were thought to be invariant. #1221 (1.6.5)
  • CMYK is properly read and written. Upon read, CMYK is auto-converted to RGB (and the "tiff:ColorSpace" metadata is set to "CMYK"). For output, if "tiff:ColorSpace" metadata is set and nonzero, the RGB passed in will be auto-converted to CMYK upon writing. #1233 #1245 (1.6.5)
  • Recognize Exif tags in the main directory, not only the special Exif directory. #1250 (1.6.5)
  • Fix bug in read_scanlines when reading TIFF files with UNassociated alpha and unusual ystride values. #1278 (1.6.6)
• ImageBuf iterator constructors with 0-size ranges or ROIs have been fixed to look like they are immediately done(). #1141 (1.6.3)
• Fix bug in internal convert_image() that could corrupt certain image copying of non-contiguous data layouts. #1144 (1.6.3)
• Also search for OIIO plugins in [DY]LD_LIBRARY_PATH. #1153 (1.6.4/1.5.16)
• Nuke plugin: don't crash with NULL Knob* in TxReaderFormat::setMipLabels. #1212 (1.6.5/1.5.20)
• idiff -q results in quiet mode -- output nothing for success, only minimal errors to stderr for failure. #1231 (1.6.5)

Build/test system improvements:

• Python plugin is now build as a cmake "module" rather than "library", which fixes some things on OSX. #1043 (1.6.0/1.5.10)
• Various build fixes for Windows. #1052 #1054 (1.6.1)
• New CMake build-time option to specify the default plugin search path. #1056 (1.6.1/1.5.12)
• Fix build breaks for very old versions of Ilmbase (1.6 and earlier) that lack a definition of V4f used by our simd.h. #1048 (1.6.1/1.5.11)
• Fix signed/unsigned warning on 32 bit platforms in jpeginput.cpp. #1049 (1.6.1/1.5.11)
• New CMake build-time option to specify the default plugin search path. #1056 (1.6.1/1.5.12)
• Fix gcc 5.0 compiler warning in PtexHalf.cpp. (1.6.1/1.5.12)
• Remove dependency of OpenSSL by default. #1086 (1.6.2/1.5.13)
• Fix warnings when compiling with C++11. (1.6.3/1.5.13)
• Dont link Python framework on OSX. #1099 (1.6.3/1.5.13)
• Changed the way testtex warps the image to give faux perspective to test texture mapping. (1.6.3)
• Build-time USE_SIMD=... has been changed from accepting a single tag to a comma-separated list of feature options. So you can, for example, do make USE_SIMD=avx,f16c ... (1.6.3)
• make USE_NINJA=1 causes CMake to build Ninja build files instead of Makefiles (they execute much faster, espectially for incremental builds). #1158 (1.6.4)
• PSD & JPEG plugins fixes for Win32 compilation. #1150 (1.6.4/1.5.16)
• Fix Nuke plugin build files to not do anything if USE_NUKE=0. #1156 (1.6.4/1.5.16)
• Builds now produce much less console output by default (use VERBOSE=1 to get all the details, most of which is only useful when debugging broken builds). #1162 (1.6.4)
• Fix support for older ffmpeg version on Ubuntu 14.04. #1168 (1.6.4/1.5.17)
• Build-time fixes for Nocona CPUs that have SSE3 without SSSE3. #1175 (1.6.4/1.5.17)
• ustring internals fixes for gcc 5.x changs to std::string ABI. #1176 (1.6.4)
• Fixes for clean build with clang 3.6. #1182,1183 (1.6.4)
• Fix signed/unsigned comparison error. #1186 (1.6.4)
• Top-level Makefile option USE_OPENCV=0 to turn off even searching for OpenCV components. #1194 (1.6.4/1.5.18)
• If a system-installed (external) PTex implementation is found, use it. Only use the "bundled" version if no other is found. Also add a top-level USE_PTEX=0 that will skip PTex support, even if the library is found. #1195,1197 (1.6.4)
• Fix compiler warnings about int vs size_t mismatches. 1199 (1.6.4)
• Improve C++11 and C++14 readiness. #1200
• Fix build break with certain new versions of libraw. #1204 (1.6.4/1.5.19)
• Fix build warnings for new Apple tools release that upgrades the standard clang release. #1218 (1.6.5/1.5.20)
• When compiling in C++11 mode, std::unordered_map, mutex, recursive_mutex, lock_guard, bind, ref, cref, thread, shared_ptr will be used rather than boost equivalents, and our own thread_group and intrusive_ptr are now used rather than the boost equivalents. We believe that this completely removes all Boost headers and types from the OIIO public APIs when in C++11 mode. (Though internals still use Boost in some cases.) #1262 #1266 (1.6.6)
• We are now set up to use Travis-CI (https://travis-ci.org) for continuous integration / automatic builds of all merges and pull requests. #1268, #1269, #1273 (1.6.6)
• Don't install fonts if USE_FREETYPE is disabled. #1275 (1.6.6)
• Use ccache for builds when detected and safe (unless USE_CCACHE=0). #1274,#1285 (1.6.7)
• Failed tests now print their non-matching text output to the console when doing 'make test'. This makes it much easier to spot most errors. #1284 (1.6.7)

Developer goodies / internals:

• Strutil additions: parse_until, parse_nested (1.6.1), repeat (#1272/1.6.6/1.5.21).
• Give Strutil::parse_string an option to not strip surrounding quotes. (1.6.4)
• Made TypeDesc::equivalent accept comparisons of arrays of unspecified length with ones of definite length. #1072 (1.6.2/1.5.13)
• Add Filesystem::rename() utility. #1070 (1.6.2/1.5.13)
• New SIMD methods: insert<>, xyz0, vreduce_add, dot, dot3, vdot, vdot3, AxBxCxDx, blend0not (1.6.2)
• array_view enhancements that let you initialize an array_view<const float> from a const std::vector<float>&. #1084 (1.6.2/1.5.14)
• hash.h contains several new hashes in namespaces 'OIIO::xxhash' and 'OIIO::farmhash'. Also, Strutil::strhash now uses farmhash rather than the Jenkins one-at-a-time hash, bringing big speed improvements (including ustring creation). Beware that the strhash value returned will be different than they were before. #1090 (1.6.3)
• fmath: safe_fast_pow improves the precision of its results for special cases of pow(x,1) and pow(x,2). #1094 (1.6.3/1.5.13)
• Added TypeDesc::TypeHalf(). #1113 (1.6.3/1.5.13)
• thread.h: our atomic types have had their API adjusted somewhat to more closely conform to C++11's std::atomic. (1.6.3)
• ustring's internals and underlying hash table have been overhauled, yielding much higher performance, especially when many threads are simultaneously creating ustrings. (1.6.3)
• ROI improvement: make intersection & union robust to uninitialized ROIs as arguments. (1.6.3)
• osdep.h is deprecated. Use platform.h instead. (1.6.3)
• The DISPATCH_TYPES utility macros used internally by IBA have been improved, and in particular the DISPATCH_COMMON_TYPES now handle ALL types ("uncommon" ones are silently converted to float). (1.6.3)
• platform.h moves the endian functions into the OIIO namespace. (1.6.3)
• platform.h adds functions for runtime query of CPU capabilities. (1.6.3)
• simd.h: float4 and int4 can now construct and load from unsigned short*, short*, unsigned char*, char*, and 'half'. (1.6.3)
• Strutil::utf8_to_unicode (1.6.3)
• Filesystem::current_path(). #1124 (1.6.3/1.5.21)
• Filesystem enumerate_file_sequence and scan_for_matching_filenames have been modified to clear their result vectors rather than simply assume they are empty. #1124 (1.6.3)
• oiiotool internals have been refactored to be class-oriented and move a lot of boilerplate repeated in each op to be part of the base class. #1127 (1.6.3)
• timer.h: Timer and ScopedTimer have changed slightly. This isn't used in any public OIIO APIs, but may affect 3rd party programs that like to use OIIO's timer.h for convenience. #1201 (1.6.4/1.5.19)
• dassert.h: added OIIO_STATIC_ASSERT macros for static assertion. Doesn't affect existing OIIO apps since they are new additions, but feel free to use them! #1202 (1.6.4/1.5.19)
• New unit test for imagecache. #1246 (1.6.5)
• Sysutil::hardware_concurrency() and physical_concurrency(). #1263 (1.6.6/1.5.21)

Release 1.5.24 (1 Mar 2016) -- compared to 1.5.23)

• Fix oiiotool --dumpdata, didn't work properly for non-float files.
• Fix broken OpenEXR multi-part output when parts have different pixel types.
• Update webp testsuite references for new webp version.

Release 1.5.23 (28 Dec 2015) -- compared to 1.5.22)

• Fix build break against Boost 1.60. #1299,#1300

Release 1.5.22 (16 Dec 2015) -- compared to 1.5.21)

• Deep OpenEXR: recognize the newer AR/AG/AB channel name convention. #1277
• Fix ffmpeg plugin compilation in some configurations. #1288
• Bug fix: TIFF read_scanlines of files with unassociated alpha didn't honor the 'ystride' parameter and could run off the end of the buffer for nonstandard stride arranagements. #1278
• Fix missing Python bindings for global OIIO::getattribute(). #1290

Release 1.5.21 (1 Dec 2015) -- compared to 1.5.20)

• Bug fix in --fit when the image didn't need to be resized. #1227
• IFF: Fix botched output of 16 bit uncompressed data. #1234
• IFF: Make "rle" compression the default for output. #1234
• OpenEXR output supports("deepdata") now correctly returns 'true'. #1238
• The lanczos3, radial-lanczos, and catrom filters have been changed from fixed-width to fully scalable. This fixes artifacts that occur when using them as upsizing filters. #1228,#1232
• Filesystem::current_path(). #1124
• Sysutil::hardware_concurrency() and physical_concurrency(). #1263
• Strutil::repeat() #1272

Release 1.5.20 (28 Sep 2015) -- compared to 1.5.19)

• Nuke plugin: don't crash with NULL Knob* in TxReaderFormat::setMipLabels. #1212
• Fix build warnings for new Apple tools release that upgrades the standard clang release. #1218
• Make TIFF reader robust to strange TIFF files that have unexpected MIP level-to-MIP level changes in planarconfig, photometric, palette, extrasamples, etc. We previously assumed these things would never vary between MIP levels of the same file, and Murphy called our bluff. #1220,1221

Release 1.5.19 (8 Sep 2015) -- compared to 1.5.18)

• Fix compile warnings on some platforms/compilers.
• Fix build break with certain new versions of libraw. #1204
• Internals: Timer and ScopedTimer have changed slightly. This isn't used in any public OIIO APIs, but may affect 3rd party programs that like to use OIIO's timer.h for convenience. #1201
• Internals: dassert.h has added OIIO_STATIC_ASSERT macros for static assertion. Doesn't affect existing OIIO apps since they are new additions, but feel free to use them! #1202

Release 1.5.18 (4 Aug 2015) -- compared to 1.5.17)

• PSD input improvements: better error handling for files lacking "global layer mask info" or "additional layer info"; additional PSD signatures for global additional layer info; better error handling when dealing with an empty layer mask. #1147
• TIFF output: recognize special "tiff:write_exif" metadata, which when present and set to 0, will skip writing the Exif directory into the TIFF file. This can be helpful when you expect the resulting TIFF file to be read with very old versions of libtiff. #1185
• Top-level Makefile option USE_OPENCV=0 to turn off even searching for OpenCV components. #1194

Release 1.5.17 (13 Jul 2015) -- compared to 1.5.16)

• Fix support for older ffmpeg version on Ubuntu 14.04. #1168
• Fix bug in fft -- was not always zeroing out the imaginary channel. #1171
• Build-time fixes for Nocona CPUs that have SSE3 without SSSE3. #1175
• ustring fixes for new gcc (5.1+) and new std::string ABI. #1176
• Fixes for unit test timer_test for new OSX versions with timer coalescing. #1181
• Fix bugs with rangecompress and rangeexpand when using luma. #1180
• Fixes for clean build when using clang 3.6. #1182

Release 1.5.16 (11 Jun 2015) -- compared to 1.5.15)

• PNG writes now honor PixelAspectRatio attribute. #1142
• Build fixes for Visual Studio 2010 #1140
• PSD & JPEG plugins fixes for Win32 compilation.
• Also search for OIIO plugins in [DY]LD_LIBRARY_PATH. #1153
• Give Strutil::parse_string an option to not strip surrounding quotes.
• Fix Nuke plugin build files to not do anything if USE_NUKE=0 #1156
• New ImageInput query: "procedural" -- returns 1 if the ImageInput may not correspond to an actual file. #1154
• TypeDesc has a new constructor and fromstring of a string_view, in addition to the old versions that took char*. #1159
• Eliminate spurious ImageCache invalidation just because the shared cache is requested again. #1157
• Fixed trilinear MIPmap texture lookups that gave invalid alpha fill. #1163
• Filesystem: sequence matching should clear results arrays upon start.

Release 1.5.15 (11 May 2015) -- compared to 1.5.14)

• Bug fix with IBA::channels() with deep data with UINT channels.
• Fix TypeDesc compatibility with OSL.
• Misc WIN32 / VS2010 fixes.
• Fix incorrect logic in convert_image with certain channel types and strides. #1144

Release 1.5.14 (10 April 2015) -- compared to 1.5.13)

• fmath: save_fast_pow improves the precision of its results for special cases of pow(x,1) and pow(x,2). #1094 (1.5.13)
• Fix warnings when compiling with C++11. (1.5.13)
• Dont link Python framework on OSX. #1099 (1.5.13)
• Improve IBA::compare() (and therefore oiiotool -diff and idiff) when the images being compared have NaN or Inf values. #1109 (1.5.13)
• TextureSystem bug fix that occasionally resulted in NaN in the alpha channel result when looking up from 3-channel images. #1108 (1.5.13)
• Added TypeDesc::TypeHalf(). #1113 (1.5.13)
• Fix IBA::channels() bugs when dealing with "deep" images. #1113 (1.5.13)
• Python ImageSpec.set_channel_formats() now works when the channel type lists are either TypeDesc, in addition to the existing support for BASETYPE. #1113 (1.5.13)
• Added Python bindings for DeepData and deep reads (ImageInput) and writes (ImageOutput). #1113 (1.5.13)
• Fix bugs in reading deep OpenEXR images with mixed channel types. #1113 (1.5.13)
• Fix bug in IBA::convolve() for the case when the kernel image passed is not a float image. #1116 (1.5.13)

Release 1.5.13 (10 Mar 2015) -- compared to 1.5.12)

• oiiotool: Bug fix for frame sequences -- could crash in Windows. #1060
• New ImageOutput::supports() tags: supports("alpha") should be true for image formats that support an alpha channel, supports("nchannels") should be true for output formats that support an arbitrary number of output channels. #1058
• oiiotool: Gracefully handle requests to save an image with more channels than the output file format can handle. Instead of being a fatal error, now it's just a warning, and extra channels are dropped. It tries to to find R, G, B, and A channels, saving them. If those names are not found, it just saves the first 3 (or 4) channels. #1058
• Improved handling of "PixelAspectRatio" for JPEG, TIFF, and OpenEXR. #1042 #1066
• oiiotool: Improve error messages when files can't be read. It is now easier to to distinguish files that don't exist from those that are an unknown format from those that are corrupted or have read errors. #1065
• maketx now writes to a temporary file, then moving it to the final requested output filename only when the write completed without error. This prevents situations where maketx crashes or is killed and leaves behind a file that looks correct but is actually corrupted or truncated. #1072
• Python: added previously-M.I.A. ImageSpec.erase_attribute(). #1063
• Add Filesystem::rename() utility. #1070
• Made TypeDesc::equivalent accept comparisons of arrays of unspecified length with ones of definite length. #1072
• oiiotool & maketx have improved error message when unknown data format names are requested with "-d". #1077
• oiiotool numeric wildcard improvement: allow more digits to match. #1082
• Remove dependency of OpenSSL by default. #1086

Release 1.5.12 (11 Feb 2015) -- compared to 1.5.11)

• Various build fixes for Windows. #1052 #1054
• New CMake build-time option to specify the default plugin search path. #1056 (1.5.12)
• OpenEXR: fixed write_tile() with AutoStride calculated the wrong default strides for "edge" tiles when the image width or length was not an integer multiple of the tile size. Also clarified the PDF and imageio.h docs in how they explain strides for this case. #1055 (1.5.12)
• maketx: when the source image was a crop (data window != display window), and the sharpening filters were used, it would incorrectly issue an "unknown filter name" error. #1059 (1.5.12)
• Fix gcc 5.0 compiler warning in PtexHalf.cpp. (1.5.12)

Release 1.5.11 (28 Jan 2015) -- compared to 1.5.10)

• Fix build breaks for very old versions of Ilmbase (1.6 and earlier) that lack a definition of V4f used by our simd.h. #1048
• Fix signed/unsigned warning on 32 bit platforms in jpeginput.cpp. #1049

Release 1.5 (26 Jan 2015) -- compared to 1.4.x

Major new features and improvements:

• New oiiotool functionality/commands:
  • --rotate90, --rotate180, --rotate270 rotate the image in 90 degree axially-aligned increments with no filtering. (1.5.2)
  • --reorient will perform whatever series of rotations or flips are necessary to move the pixels to match the "Orientation" metadata that describes the desired display orientation. (1.5.2)
  • --autoorient will automatically do the equivalent of --reorient on every image as it is read in, if it has a nonstandard orientation. (This is generally a good idea to use if you are using oiiotool to combine images that may have different orientations.) (1.5.2)
  • --rotate rotates an image by arbitrary angle and center point, with high-quality filtering. #932 (1.5.3)
  • --warp transforms an image using a 3x3 matrix, with high-quality filtering. #932 (1.5.3)
  • --median performs a median filter. (1.5.4)
• New ImageBufAlgo functions:
  • rotate90(), rotate180(), rotate270() rotate the image in 90 degree axially-aligned increments with no filtering. (1.5.2)
  • reorient() will perform whatever series of rotations or flips are necessary to move the pixels to match the "Orientation" metadata that describes the desired display orientation. (1.5.2)
  • rotate() performs rotation with arbitrary angle and center point, with high-quality filtering. #932 (1.5.3)
  • warp() transforms an image by a 3x3 matrix, with high-quality filtering. #932 (1.5.3)
  • median_filter performs a median filter. (1.5.4)
• Significant internal speedups by utilizing SIMD instructions (SSE) in the TextureSystem (1.5.5 / #948, 1.5.6 / #990). To use this to its fullest extent, build OIIO with the make/cmake option USE_SIMD=arch, where arch is sse2, ssse3, sse4.1, sse4.2, depending on what machines you'll be deploying to. (Note that x86_64 automatically implies at least sse2.) We're finding that this has approximately doubled the speed of the math part of texture mapping (it doesn't speed up the disk I/O, of course). (1.5.5)
• Basic support for many movie files via a plugin using 'ffmpeg'. Works with avi, mov, qt, mp4, m4a, 3gp, 3g2, mj2, m4v, mpg, and more. Movie files simply look like multi-image files to OIIO. There isn't really support for audio yet, and although this lets you retrieve and process individual frames of a movie file, OIIO is still not meant to be a video-processing library. Currently, these formats can be read, but there is no write support (maybe coming soon). #928 #1010 (1.5.5)
• Nuke plugins -- a txReader plugins that will read OIIO texture files, and a txWriter that will output proper (tiled & mip-mapped) texture files from Nuke. Contributed by Nathan Rusch / Luma Pictures. #973 (1.5.6)

Public API changes:

• TextureSystem API calls have been modified: the nchannels, dresultds, dresultdt fields have been removed from TextureOpt and are now passed explicitly as arguments to texture(), environment(), and texture3d(). Some long-deprecated methods of TextureSystem have been removed, and also some new API calls have been added that provide multi-point texturing given a TextureHandle/PerThread rather than a ustring filename. (1.5.5) (#948)
• New filters available to direct users of filter.{h,cpp} and for ImageBufAlgo, oiiotoo, and maketx: "cubic", "keys", "simon", "rifman". (1.5.0/1.4.9) (#874)
• Global attribute "read_chunk" can set the default number of scanlines read at a time internally by read_image() calls. #925
• The Python ImageBuf class did not expose an equivalent to the C++ ImageBuf::get_pixels. This is exposed now. #931 (1.5.3)
• The Filter API now uses string_view. (1.5.3)
• ImageBuf and ImageBufAlgo now use string_view extensively. (1.5.4)
• ImageInput::supports() and ImageOutput::supports() now accept new tags: "arbitrary_metadata" reveals if the format allows arbitrarily-named metadata; "exif" if the format can store camera Exif data; "iptc" if the format can store IPTC metadata. #1001 (1.5.7)
• Removed ImageBuf and ImageBufAlgo functions that have been deprecated since OIIO 1.3. #1016 (1.5.8)
• ImageCache::add_file has been extended to allow an ImageSpec pointer as "configuration", which will be passed along to the underlying ImageInput::open() when the file is first opened. This allows you to use the same kind of configuration options/hints that you would with a raw ImageInput. (1.5.8)
• ImageBuf constructor and reset methods have been extended to allow an ImageSpec pointer as "configuration", which will be passed along to the underlying ImageCache and/or ImageInput::open() when the file is first opened. This allows you to use the same kind of configuration options/hints that you would with a raw ImageInput. (1.5.8)
• The DeepData helper structure now has methods to set (already allocated) deep values, as well as to retrieve uint values. (1.5.8)
• ImageBuf methods to get and set deep values and to allocate the DeepData structure. (1.5.8)
• ImageBuf::interppixel_NDC has been changed to consider the coordinates relate to full (aka display) window, rather than data window. (1.5.8)
• ImageBuf::interppixel_bicubic and interppixel_bicubic_NDC added to sample an image with B-spline bicubic interpolation. (1.5.8)
• Clarified in the docs that TextureSystem::get_texture_info and ImageCache::get_image_info "exists" queries should return true, and place in *data the value 1 or 0 depending on whether the image exists and can be read. (1.5.10)
• Clarified in the docs that TextureSystem::get_texture_info and ImageCache::get_image_info "exists" queries should return true, and place in *data the value 1 or 0 depending on whether the image exists and can be read. (1.5.10)

Fixes, minor enhancements, and performance improvements:

• ImageBufAlgo:
  • flip(), flop(), flipflop() have been rewritten to work more sensibly for cropped images. In particular, the transformation now happens with respect to the display (full) window, rather than simply flipping or flopping within the data window. (1.5.2)
  • channels() now works properly with "deep" images. (1.5.8)
• oiiotool:
  • oiiotool --nosoftwareattrib suppresses the altering of Software and ImageHistory fields upon output. (1.5.1)
  • oiiotool --ch now will search for channel names case-insensitively, if the channel names are not first found with case-sensitive compares. #897 (1.5.1/1.4.11)
  • oiiotool --wildcardoff/--wildcardon can selectively disable and re-enable the frame sequence numeric wildcards (useful if you have a filename or other argument that must actually contain '#' or '@' characters). #892 (1.5.1/1.4.11)
  • oiiotool --no-autopremult/--autopremult can disable and re-enable the automatic premultiplication of color by opacity, in files where they are stored not-premultiplied and you wish to preserve the original un-premultiplied values. #906 (1.5.1/1.4.11)
  • oiiotool --sansattrib omits "-attrib" and "-sattrib" and their arguments from the command line that is put in the Software and ImageHistory metadata (makes it less pointlessly verbose). (1.5.1)
  • Now get helpful error messages if input images are corrupt or incomplete. (1.5.1)
  • oiiotool --flip, --flop, --flipflop, and --transpose now have more sensible behavior for cropped images. (1.5.2)
  • oiiotool --orientcw, --orientccw, and --orient180 are the new names for --rotcw, --rotccw, --rot180. The old names were confusing, and now it is more clear that these merely adust the Orientation metadata that suggests viewing orientation, rather than actually rotating the image data. (1.5.2)
  • oiiotool color conversion ops crashed when inputs were files with MIPmap levels (such as textures). #930 (1.5.3/1.4.13)
  • More graceful handling when outputting an image with negative pixel window origin to a file format that doesn't support this feature. (1.5.3)
  • oiiotool --unsharp_mask:kernel=median will perform a median filter for the blurring step (rather than a gaussian or other convolution filter), which tends to sharpen small details but not over-sharpen long edges as the traditional unsharp mask often does. (1.5.4)
  • oiiotool's help message now says explicitly if it was compiled without any support for OpenColorIO. (1.5.5/1.4.15)
  • oiiotool -stats, on deep files, now prints a histogram of the number of samples per pixel. #992 (1.5.6)
  • oiiotool --dump of "deep" files improves output with int32 channels (1.5.6).
  • oiiotool --stats of "deep" files prints a histogram of samples/pixel (1.5.6).
  • oiiotool -subimage has better error detection and reporting for requests for nonexistant subimages. #1005 (1.5.7)
  • oiiotool --ch is a bit more flexible in its channel-shuffling syntax: you are now able to say newchannel=oldchannel, both shuffling and renaming channels simultaneously, thus removing a frequent necessity of a --chnames action following a --ch. (1.5.8)
  • oiiotool -d now supports uint32, sint32. #1013 (1.5.8)
  • oiiotool -native forces native data format read in cases where going through the ImageCache would have sacrificed precision or range. #1014 (1.5.8)
  • oiiotool --resize (and similar, such as --fix, --resample, etc.) size specifiers now allow percentage values that are not the same in each direction, such as "200%x50%", which would double horizontal resolution while cutting vertical resolution in half. #1017 (1.5.8)
  • oiiotool --ch now works properly with "deep" images. (1.5.8)
• maketx & TextureSystem:
  • texture lookups have roughly doubled in performance because of SSE optimization. (1.5.5 / #948, 1.5.6 / #990).
  • maketx: Fix case typo for LatLong env map creation when in 'prman' mode. #877. (1.5.1/1.4.10)
  • maketx --attrib, --sattrib, and --sansattrib now work like oiiotool; in other words, you can use command line arguments to add or alter metadata in the process of creating a texture. #901 (1.5.1)
  • maketx --sharpen <AMT> adds slight sharpening and emphasis of higher frequencies when creating MIP-maps. #958 (1.5.5)
  • Fix crash when using maketx --checknan (1.5.5)
  • maketx now embeds metadata hints ("oiio:ConstantColor") for constant textures (all pixels are identical). The texture system notices this hint and will automatically replace texture lookups (as long as wrap mode is not black) with this constant value, about 10x faster than a real texture lookup would have been. This sounds silly, but in production sometimes you end up with uniform textures and this helps. Also, you can retrieve the constant color via get_texture_info of "constantcolor" and "constantalpha" (though the retrieval will only succeed if the metadata is present, even if the texture is actually constant). #1006 (1.5.7)
  • maketx now embeds metadata hints ("oiio:AverageColor") containing the average value of the texture. This can be retrieved with get_texture_info of "averagecolor" and "averagealpha". #1006 (1.5.7)
• Python:
  • Bug fix: the Python binding of ImageInput.read_scanlines did not properly honor any channel subset specified. (1.5.5/1.4.15)
  • All of the expensive functions in the Python bindings now release the Python GIL (global interpreter lock) as much as possible. This allows other Python threads to make progress even when OIIO is doing a lengthy operation such as file I/O or an expensive image processing operation. (1.5.5)
  • Bug fix in ImageInput: could crash if calling ImageInput.read_* functions without specifying a data format. #998 (1.5.6)
  • Bug fix in ImageOutput: could crash if calling ImageInput.write_* functions if the buffer format did not match the file data format. #999 (1.5.6)
• OpenEXR:
  • Improve the quality of lossy b44 compression by more correctly using the pLinear value of channels (we were incorrectly using the flag to indicate linear channels, but it's really for channels that are perceptually linear). (#867) (1.5.0/1.4.9)
  • Fix potential build breaks due to incorrect use of Imf::isDeepData() which apparently was not intended to be an externally-visible function. (1.5.0/1.4.9) (#875)
  • Fix crashes/exceptions when passing string array attributes for OpenEXR output. #907 (1.5.1/1.4.11)
  • Improved ordering of channel names for OpenEXR files with many "layers". #904 (1.5.1/1.4.11)
  • Fixed issue where a stringvec of 16 items was mishandled as a matrix. #929 (1.5.3/1.4.13)
  • OpenEXR 2.2 support, including the new DWAA/DWAB compression modes. (1.5.4)
  • Fix bug that prevented proper saving/reporting of subimage name for multi-subimage OpenEXR files. (1.5.5).
  • Fix read_deep_tiles() error when not starting at the image origin. #1040 (1.6.0/1.5.10)
  • Fix output of multi-part exr file when some parts are tiled and others aren't. #1040 (1.6.0/1.5.10)
• JPEG:
  • Fix broken recognition of .jfi extension. (#876)
  • Read and write ICC profiles as attribute "ICCProfile". (#911)
  • Fix seek_subimage for JPEG input -- did not properly return the spec. (1.5.2/1.4.12)
  • Support for reporting and controlling chroma-subsampling value, via the "jpeg:subsampling" attribute. #978 (1.5.5)
• PNG:
  • Read and write ICC profiles as attribute "ICCProfile". (#911)
• TIFF:
  • Read and write ICC profiles as attribute "ICCProfile". (#911)
  • Graceful handling of output of images with negative data window origin. (1.5.3)
  • Improved precision when auto-premultiplying 8 bit unassociated alpha images (if the user is reading them into a higher-precision buffer). #960, #962 (1.5.2)
  • Change default compression (if otherwise unspecified) to "zip". (1.5.6)
  • Robust to Exif blocks with corrupted GPS data. #1008 (1.5.8/1.4.16)
  • Fixes to allow proper output of TIFF files with uint32 or int32 pixels (1.5.8)
• RAW:
  • Fix for portrait-orientation image reads. (#878) (1.5.1/1.4.10)
  • Fix bug with "open with config" options. #996 (1.5.6)
• RLA: Fix bug that caused RLA output to not respect requests for 10 bit output (would force it to 16 in that case). #899 (1.5.1)
• ImageSpec::get_float_attribute() is now better about retrieving values that were stored as integers, even though you are querying them as floats. (#862) (1.5.0/1.4.9)
• ImageCache fix for when files are not found, then subsequently the searchpath is changed. #913 (1.4.12/1.5.2)
• Fixed some alloca calls that did not get the right amount of memory. (#866) (1.5.0/1.4.9)
• Fix an off-by-one loop in IBA::resize that would not get the wrong image result, but might trigger debuggers to flag it as touching the wrong memory. (#868) (1.5.0/1.4.9)
• Better exception safety in Filesystem::scan_for_matching_filenames(). #902 (1.5.1/1.4.11)
• Python: ImageBuf.get_pixels() is now implemented, was previously omitted. (1.5.2)
• TextureSystem: anisotropic texture lookups are slightly sped up (~7%) by using some approximate math (but not visibly different) #953. (1.5.5)
• Better exception safety in Filesystem::exists() and similar functions. #1026 (1.5.8/1.4.16)

Build/test system improvements:

• Fix several compiler warnings and build breakages for a variety of platforms and compiler versions. (#858, #861) (1.5.0/1.4.8)
• Move around some cpack-related components. (#863) (1.5.0/1.4.9)
• Allow in-source build (not recommended, but necessary for Macports). (#863) (1.5.0/1.4.9)
• Fixes to docs-building makefiles. (#873) (1.5.0/1.4.9)
• More robust build when OpenEXR and IlmBase have installed their respective header files in different directories rather than the expected behavior of being installed together. (#861) (1.5.0/1.4.9)
• Fix build break in DEBUG compiles for ustring internals. (#869) (1.5.0/1.4.9)
• Fix warnings about potentially uninitialized variables. (#871) (1.5.0/1.4.9)
• Make thread.h use more modern gcc intrinsics when gcc >= 4.8, this allows correct thread.h operations for PPC and MIPS platforms that were't working before. (#865) (1.5.0/1.4.9)
• Fix Windows build when OIIO_STATIC_BUILD is used. (#872) (1.5.0/1.4.9)
• Fixes to get a clean compile on Windows + MSVC 9. (#859) (1.5.0/1.4.8)
• Fixes to get a clean compile on Windows + MSVC 9. (#872) (1.5.0/1.4.9)
• Make 3.0 compatibility fixes on OSX. (1.5.1/1.4.10)
• Fix segfaults on 32 bit systems with gcc 4.2. #889 (1.5.1/1.4.11)
• Fixes to Filesystem internals to work with older Boost releases older than 1.45. #891 (1.5.1/1.4.11)
• Fixes to find libraw properly with Visual Studio 2010. #895 (1.5.1/1.4.11)
• Fix bad casts in thread.h that broke some platforms. #896 (1.5.1/1.4.11)
• Several fixes for Windows build, including properly finding OpenEXR libraries when OpenEXR 2.1 is used. (1.5.1/1.4.11)
• Fixes to fmath.h to work with MSVC 2013 (some long-omitted math ops that we'd always needed to define for Windows only are finally supported in MSVC 2013). #912 (1.4.12/1.5.2) #927 (1.4.13/1.5.3)
• Fix for Linux + Boost >= 1.55 combination: need to link with -lrt. #914 (1.4.12/1.5.2)
• Fix Ptex + static linkage. (1.4.12/1.5.2)
• Rudimentary support for C++11: building with USE_CPP11=1 tries to set compiler flags (for gcc and clang, anyway) to use C++11 mode, and also building with USE_LIBCPLUSPLUS=1 tries to link with libc++ if you are using clang. (1.5.2)
• Fixes for Boost Filesystem 1.46-1.49. (1.5.2/1.4.12)
• testtex new options: --nchannels (forces num channels to look up, rather than always doing what's in the file), --derivs (force the kind of texture calls that return derivs of the texture lookups. (1.5.4)
• Make it able to compile against giflib >= 5.1. #975 (1.4.14/1.5.5)
• Add an option to link against static Ilmbase and OpenEXR libraries (1.5.5).
• Add testtex options -interpmode and -mipmode. #988 (1.5.6)
• Build against Python 3 if the make/cmake build flag USE_PYTHON3=1 is used. (1.5.6)
• grid.tx and checker.tx have been moved from ../oiio/images to testsuite/common/texture (allow it to be versioned along with any changes to maketx. (1.5.7)
• Support for freetype 2.5.4. #1012 (1.5.8/1.4.16)
• Python plugin is now build as a cmake "module" rather than "library", which fixes some things on OSX. #1043 (1.6.0/1.5.10)

Developer goodies / internals:

• New Strutil string comparison functions: starts_with, ends_with. (1.5.1/1.4.10)
• New Strutil simple parsing functions: skip_whitespace, parse_char, parse_until_char, parse_prefix, parse_int, parse_float, parse_string, parse_word, parse_identifier, parse_until. (1.5.1/1.4.10, 1.5.2/1.4.11)
• New Filesystem functions: create_directory, copy, remove, remove_all, temp_directory_path, unique_path. (1.5.1/1.4.10)
• thread.h: add atomic_exchange() function. #898 (1.5.1/1.4.11)
• Improved error propagation through ImageCache, ImageBuf, and oiiotool. (1.5.1)
• Moved certain platform-dependent macros from sysutil.h to platform.h (1.5.4/1.4.16)
• ustring: add comparisons between ustrings versus char* and string_view. (1.5.4)
• New simd.h exposes float4, int4, and mask4 classes that utilize SSE instructions for big speedups. (1.5.5 / #948, #954, #955)
• Big reorganization of fmath.h, moved stuff around, organized, added lots of safe_blah() functions that clamp to valid ranges and fast_blah() functions that are approximations that may differ slightly several decimal places in but are much faster than the full precision libm/IEEE versions. #953, #956 (1.5.5)
• New utility function: premult(), which can premultiply non-alpha, non-z channels by alpha, for a whole buffer (with strides, any data type). #962 (1.5.5)
• Timer API now has queries for ticks as well as seconds. (1.5.5)
• platform.h now has macros to mark functions as pure, const, nothrow, or unused. (1.5.5)
• Filesystem::read_text_file reads a whole text file into a string efficiently. (1.5.8)

Release 1.4.16 (19 Jan 2015 -- compared to 1.4.15)

• Fix gcc 4.9 warnings.
• Improved error propagation through ImageCache, ImageBuf, and oiiotool.
• TIFF more robust to Exif blocks with corrupted GPS data. #1008
• Support for freetype 2.5.4. #1012
• Better exception safety in Filesystem::exists() and similar functions. #1026

Release 1.4.15 (24 Nov 2014 -- compared to 1.4.14)

• OpenEXR: fix botched writing of subimage name.
• 'oiiotool --help' now says explicitly if it was built without OpenColorIO enabled.
• Python read_scanlines() did not honor the channel subset.
• RAW file reading: the open-with-config variety had the wrong function signature, and therefore did not properly override the base class, causing configuration hints to be ignored.
• Bug fix in Python ImageInput: could crash if calling ImageInput.read_* functions without specifying a data format. #998
• Bug fix in Python ImageOutput: could crash if calling ImageInput.write_* functions if the buffer format did not match the file data format. #999
• RAW: Fix bug with "open with config" options. #996

Release 1.4.14 (20 Oct 2014 -- compared to 1.4.13)

• GIF: Fix to make it able to compile against giflib >= 5.1. #975
• JPEG support for reporting and controlling chroma-subsampling value, via the "jpeg:subsampling" attribute. #978

Release 1.4.13 (12 Sep 2014 -- compared to 1.4.12)

• Now builds against OpenEXR 2.2, including support for the new DWAA and DWAB compression modes.
• OpenEXR: fixed issue where a stringvec of 16 items was mishandled as a matrix.
• Fix fmath.h to move the 'using' statements around properly.
• Fix oiiotool color conversion bug that crashed when the input image was a file with MIP levels.
• TIFF output now gracefully handles negative origins without hitting an assertion.
• Developer details: platform macros moved from sysutil.h to platform.h. (But sysutil.h now includes platform.h, so you shouldn't notice.)
• Developer details: ustring now has comparisons between ustrings versus char* and string_view.

Release 1.4.12 (31 Jul 2014 -- compared to 1.4.11)

• ImageCache fix for when files are not found, then subsequently the searchpath is changed. #913 (1.4.12/1.5.2)
• Fixes to fmath.h to work with MSVC 2013 (some long-omitted math ops that we'd always needed to define for Windows only are finally supported in MSVC 2013). #912 (1.4.12/1.5.2)
• Fix for Linux + Boost >= 1.55 combination: need to link with -lrt. #914 (1.4.12/1.5.2)
• Fix Ptex + static linkage. (1.4.12/1.5.2)

Release 1.4.11 (9 Jul 2014 -- compared to 1.4.10)

• OpenEXR output fix for crashes/exceptions when passing string array attributes. #907
• Improved ordering of channel names for OpenEXR files with many "layers". #904
• oiiotool --ch now will search for channel names case-insensitively, if the channel names are not first found with case-sensitive compares. #897
• oiiotool --wildcardoff/--wildcardon can selectively disable and re-enable the frame sequence numeric wildcards (useful if you have a filename or other argument that must actually contain '#' or '@' characters). #892
• oiiotool --no-autopremult/--autopremult can disable and re-enable the automatic premultiplication of color by opacity, in files where they are stored not-premultiplied and you wish to preserve the original un-premultiplied values. #906
• Fix segfaults on 32 bit systems with gcc 4.2. #889
• Fixes to Filesystem internals to work with older Boost releases < 1.45. #891
• Fixes to find libraw properly with Visual Studio 2010. #895
• Fix bad casts in thread.h that broke some platforms. #896
• Strutil: add another variety of parse_identifier with an expanded character set.
• thread.h: add atomic_exchange() function. #898
• Several fixes for Windows build, including properly finding OpenEXR libraries when OpenEXR 2.1 is used.
• Better exception safety in Filesystem::scan_for_matching_filenames(). #902

Release 1.4.10 (20 Jun 2014 -- compared to 1.4.9)

• Fix for portrait-orientation RAW image reads. (#878)
• maketx: Fix case typo for LatLong env map creation when in 'prman' mode (#877).
• New Strutil string comparison functions: starts_with, ends_with.
• Make 3.0 compatibility fixes on OSX.
• New Strutil simple parsing functions: skip_whitespace, parse_char, parse_until_char, parse_prefix, parse_int, parse_float, parse_string, parse_word, parse_identifier, parse_until.
• New Filesystem functions: create_directory, copy, remove, remove_all, temp_directory_path, unique_path.

Release 1.4.9 (6 Jun 2014 -- compared to 1.4.8)

• Allow in-source build (not recommended, but necessary for MacPorts). (#863)
• CPack improvements. (#863)
• Fixes to docs-building makefiles. (#873)
• Make ImageSpec::get_float_attribute correctly convert many integer types. (#862)
• Fixed some alloca calls that did not get the right amount of memory. (#866)
• OpenEXR: Improve the quality of lossy b44 compression by more correctly using the pLinear value of channels (we were incorrectly using the flag to indicate linear channels, but it's really for channels that are perceptually linear). (#867)
• More robust build when OpenEXR and IlmBase have installed their respective header files in different directories rather than the expected behavior of being installed together. (#861)
• Fix an off-by-one loop in IBA::resize that would not get the wrong image result, but might trigger debuggers to flag it as touching the wrong memory. (#868)
• Fix build break in DEBUG compiles for ustring internals. (#869)
• Fix warnings about potentially uninitialized variables. (#871)
• Make thread.h use more modern gcc intrinsics when gcc >= 4.8, this allows correct thread.h operations for PPC and MIPS platforms that were't working before. (#865)
• Fix Windows build when OIIO_STATIC_BUILD is used. (#872)
• Fixes to get a clean compile on Windows + MSVC 9. (#872)
• New filters available to direct users of filter.{h,cpp} and for ImageBufAlgo, oiiotoo, and maketx: "cubic", "keys", "simon", "rifman". (#874)
• OpenEXR: Fix potential build breaks due to incorrect use of Imf::isDeepData() which apparently was not intended to be an externally-visible function. (#875)
• JPEG: Fix broken recognition of .jfi extension. (#876)

Release 1.4.8 (23 May 2014 -- compared to 1.4.7)

• Fix several compiler warnings and build breakages for a variety of platforms and compiler versions. No new feature or true bug fixes. #857, #858, #859

Release 1.4 (19 May 2014) -- compared to 1.3.x

Major new features and improvements:

• The PNM reader now supports "PFM" files, which are the floating point extension to PNM. (1.4.1)
• Preliminary support for reading a wide variety of digital camera "RAW" files. (1.4.1)
• New oiiotool commands:
  • --cpow : raise pixel values to a power (1.4.1)
  • --label : give a name to the top-of-stack image, can be referred to later in the command line (1.4.1)
  • --cut : combine --crop, --origin +0+0, and --fullpixels. (1.4.3)
  • --pdiff : perceptual diff (#815) (1.4.4)
  • --polar, --unpolar : complex <-> polar conversion. (#831) (1.4.5)
• oiiotool --resize and --fit, and also maketx when using "good" filters for downsizing, have been significantly sped up. When downsizing with large filters, we have seen up to 3x improvement. (#808) (1.4.3)

Public API changes:

• New ImageBufAlgo functions:
  • pow() raises pixel values to a power. (1.4.1)
  • cut() cuts a region of pixels and moves it to the origin (combines crop, reset origin, and set full res = data resolution). (1.4.3)
  • complex_to_polar() and polar_to_complex() convert from (real,imag) to (amplitude,phase) and back. (#831) (1.4.5)
• New string_view class (in string_view.h) describes a non-owning reference to a string. The string_view is now used in many places throughout OIIO's APIs that used to pass parameters or return values as char* or std::string&. Read string_view.h for an explanation of why this is good. (1.4.2, 1.4.3) (N.B. this was called string_ref until 1.4.6, when it was renamed string_view to conform to C++17 draft nomenclature.)
• New array_view<>, array_view_strided<>, strided_ptr<>, and image_view<> templates are great utility for passing bounded and strided arrays. (1.4.3)
• Removed deprecated PT_* definitions from typedesc.h.
• Removed the quantization-related fields from ImageSpec. (1.4.3)
• Dither: If ImageOutput::open() is passed an ImageSpec containing the attribute "oiio:dither" and it is nonzero, then any write_*() calls that convert a floating point buffer to UINT8 output in the file will have a hashed dither added to the pixel values prior to quantization in order to prevent the appearance of visible banding. The specific nonzero value passed for the attribute will serve as a hash seed so that the pattern is repeatable (or not). (1.4.3)

Fixes, minor enhancements, and performance improvements:

• Improved oiiotool features:
  • --stats on deep files now prints additional info, such as the minimum and maximum depth and on which pixels they were encountered, as well as which pixel had the maximum number of depth samples. (1.4.1)
  • --resize and --resample allow WIDTHx0 or 0xHEIGHT, where the '0' value will be interpreted as automatically computing the missing dimension to preserve the aspect ratio of the source image. (#797, #807) (1.4.3)
  • Fixed possible crash when using --origin with tiled, cached images. (1.3.12/1.4.2)
  • --pdiff does a perceptual diff (like 'idiff -p'). (#815) (1.4.4)
  • --dumpdata takes a noptional modifier empty=0 that will cause empty deep pixels to not produce any output. (#821) (1.4.5)
  • --dumpdata correctly prints values of uint32 channels. #989 (1.5.6) deep pixels to not produce any output. (#821) (1.4.5)
  • --polar, --unpolar convert from complex (real,imag) to polar (amplitude, phase) and vice versa. (#831) (1.4.5)
  • View wildcards: similar to frame range wildcards, "%V" is replaced by new names, "%v" by the first letter of each view. The view list is {"left","right"} by default, but may be set with the --views argument. (1.4.5)
  • --over and --zover set the resulting display/full window to the union of those of the inputs; previously it set the display window to that of the foreground image, which is often a poor default. (1.4.7)
• ImageCache/TextureSystem:
  • The multi-point version of environment() was broken. (1.3.9/1.4.1)
  • Don't honor the SHA-1 fingerprint found in a file if the "Software" metadata doesn't indicate that the file was written by maketx or oiiotool. (1.4.3)
• OpenEXR:
  • Multi-part EXR (2.0) didn't write the required "name" attribute for each part. (1.3.10/1.4.1)
  • Fix crashing bug when reading stringvector attributes in the file. (1.3.11/1.4.2)
  • Add .sxr and .mxr as possible filename extensions (1.3.12/1.4.2)
  • Smarter channel ordering of input of files with ZBack, RA, GA, or BA channels (#822) (1.4.5).
  • Adhere to the misunderstood limitation that OpenEXR library doesn't allow random writes to scanline files. (1.4.6)
  • More robust with certain malformed metadata. (#841) (1.4.6)
• TIFF: Give a more explicit error message for unsupported tile sizes (1.4.4)
• GIF: Fixes to subimage generation; GIF frames are treated as sequential windows to be drawn on canvas rather than as independent images; respect "disposal" method; initial canvas is now transparent and all GIFs are presented as 4-channel images. (#828) (1.4.5)
• iconvert: properly handle multi-image files for formats that can't append subimages. (1.3.10/1.4.1)
• iv info window should print native file info, not translated ImageBuf/ImageCache info. (1.3.10/1.4.1)
• Fix ImageCache::get_pixels() for the chbegin != 0 case, when cache and output buffer types were not identical. (1.3.10/1.4.1)
• DPX:
  • Fixed several places in the where it could have had buffer overruns when processing certain malformed string fields. (1.4.1)
  • Fixed inappropriate use of "dpx_ImageDescriptor" could make invalid DPX files (especially when reading metadata from one DPX file, changing the number of channels, then writing out again as a DPX file). (1.3.10/1.4.1)
  • For output, honor the "Software" metadata attribute passed in. (1.3.11/1.4.2)
  • Ignore negative image origin values, which are not allowed by the DPX spec which states they are unsigned. (#813) (1.4.4)
  • Fix improper handling of unsupported pixel data types. (#818) (1.4.5)
  • Accept pixel ratio (x/0) to mean 1.0, not NaN. (#834) (1.4.5/1.3.13)
  • Pad subimages to 8k boundaries, as suggested by the DPX spec (1.4.7)
  • Properly write "userdata" field to DPX files if set. (1.4.7)
• PNG:
  • add "png:compressionlevel" and "compression" strategy attributes. (1.3.12/1.4.2)
  • output properly responds to "oiio:UnassociatedAlpha"=1 to indicate that the buffer is unassociated (not premultiplied) and therefore it should not automatically unpremultiply it. (1.4.5)
• Make ImageBuf iterators return valid black pixel data for missing tiles. (1.3.12/1.4.2)
• Make the ImageOutput implementations for all non-tiled file formats emulate tiles by accepting write_tile() calls and buffering the image until the close() call, at which point the scanlines will be output. (1.4.3)
• All ImageBufAlgo functions, and oiiotool, strip any "oiio:SHA-1" hash values in the metadata in order not to confuse the TextureSystem. (1.4.3)
• IFF: accept write_scanline, even though IFF is tile only. (1.4.3)
• The implementation of the Lanczos filter (and any operations using it) have been sped up by using an approximate fast_sinpi instead of the more expensive sin() (1.4.3).
• Speed up iinfo --hash / oiiotool --hash by about 20%. (#809) (1.4.4)
• All format writer plugins: ensure that calling close() twice is safe. (#810) (1.4.4)
• oiiotool --info and iinfo output have been altered slightly to make them match and be consistent. Also, oiiotool didn't say that deep files were deep (1.4.4).
• Fixed bad bugs in IBA::flatten() and oiiotool --flatten. (#819) (1.4.5)
• Fix Parameter neglect of properly copying the m_interp field for assignment and copy construction. (#829) (1.4.5/1.3.13)
• Fix ImageBufAlgo::circular_shift (and oiiotool --cshift) that did not wrap correctly for negative shifts. (#832) (1.4.5/1.3.13)
• The "gaussian" flter incorrectly had default width 2 (correct = 3), and the "mitchell" filter incorrect had default width 3 (correct = 4). These were bugs/typos, the new way is correct. If you were using those filters in ways that used the default width value, appearance may change slightly. (1.4.6)

Build/test system improvements:

• libOpenImageIO_Util is now built that only has the utility functions in libutil (in addition to the libOpenImageIO, which contains everything). This is handy for apps that want to use OIIO's utility functions (such as ustring or Filesystem) but doesn't really need any of the image stuff. A build flag BUILD_OIIOUTIL_ONLY=1 will cause only the util library to be built. (1.4.1)
• New build option OIIO_THREAD_ALLOW_DCLP=0 will turn off an optimization in thread.h, resulting in possibly worse spin lock performance during heavy thread contention, but will no longer get false positive errors from Thread Sanitizer. The default is the old way, with full optimization! (1.4.1)
• More robust detection of OpenEXR library filenames. (1.4.1)
• Always reference OpenEXR and Imath headers as <OpenEXR/foo.h> rather than <foo.h>. (1.4.1)
• Unit test strutil_test now comprehensively tests Strutil. (1.4.1)
• Fix broken build when EMBEDPLUGINS=0. (1.4.3/1.3.13)
• Fix broken build against OpenEXR 1.x. (1.4.3/1.3.13)
• version.h has been renamed oiioversion.h. For back compatibility, there is still a version.h, but it merely includes oiioversion.h. (#811) (1.4.4)
• Moved all the public header files from src/include to src/include/OpenImageIO, so that the src/include area more closely matches the layout of an OIIO install area. (#817) (1.4.4)
• Fix compilation problems for PowerPC (#825). (1.4.5/1.3.13)
• Fixes for OpenBSD compilation. (#826/#830) (1.4.5/1.3.13)
• Fixes for Linux compilation when building with BUILDSTATIC=1. (1.4.6)
• Fixes for compilation against IlmBase/OpenEXR 2.1. (1.4.6)
• Improve finding of Freetype on some systems (1.4.6).
• Add to top level Makefile the option STOP_ON_WARNING=0 to let it cleanly compile code that generates compiler warnings, without stopping the build. (1.4.7)

Developer goodies / internals:

• TBB has been removed completely. (1.4.2)
• Slightly faster timer queries in timer.h for OSX and Windows. (1.4.1)
• Strutil :
  • safe_strcpy() -- like strncpy, but copies the terminating 0 char. (1.4.1)
  • split() fixes bug when maxsplit is not the default value. (1.3.10/1.4.1)
• ParamValue/ParamValueList :
  • ParamValue now allows get/set of the internal 'interp' field. (1.3.9/1.4.1)
  • ParamValueList::push_back is not properly const-ified. (1.4.1)
  • New PVL::find() lets you search on the PVL. (1.4.6)
• fmath.h :
  • New fast_sin, fast_cos, fast_sinpi, fast_cospi are much faster polynomial approximations (with max absolute error of ~0.001). (1.4.3)
  • round_to_multiple_of_pow2 - a faster version of the existing round_to_multiple(), but only works when the multiple is known to be a power of 2. (1.4.6)
• TypeDesc now has operator<, which makes it easier to use STL data structures and algorithms that expect an ordering, using TypeDesc as a key. (1.4.6)
• thread.h
  • Slight thread.h portability tweaks. (1.4.1)
  • spin_rw_lock now has more standard lock()/unlock() as synonym for for exclusive/write lock, and lock_shared()/unlock_shared() as synonym for "read" locks. (1.4.6)
• ustring :
  • new ustringLess and ustringHashIsLess functors make it easier to use ustring as keys in STL data structures and algorithms that require an ordering function. (1.4.6)
  • improve thread performance significantly by using an unordered_map_concurrent internally for the ustring table. (1.4.6)
• unordered_map_concurrent.h :
  • Allow umc template to specify a different underlying map for the bins. (1.4.6)
  • Add retrieve() method that's slightly faster than find() when you just need a value, not an iterator. (1.4.6)
  • Align bins to cache lines for improved thread performance. (1.4.6)
• ImageBuf iterators have a new rerange() method that resets the iteration range, without changing images or constructing a new iterator. (1.4.6)

Release 1.3.14 (19 May 2014 -- compared to 1.3.13)

• OpenEXR output: More robust with certain malformed metadata. (#841) (1.4.6)
• Rename the string_ref class to string_view. (This is unused in OIIO, it is for compatibility with OSL.)
• Build fixes on Linux when using BUILDSTATIC=1.
• Add round_to_multiple_of_pow2 to fmath.h
• Add STOP_ON_WARNING option to the top level Makeile wrapper.
• Add documentation on the Python binding for IBA::cut.
• oiiotool --over and --zover now set the output image's display window to the union of the inputs' display window, rather than to the foreground.

Release 1.3.13 (2 Apr 2014 -- compared to 1.3.12)

• Bug fix to string_ref::c_str().
• Make ImageBuf iterators return valid black pixel data for missing tiles.
• Fix broken build when EMBEDPLUGINS=0.
• Fix broken build when building against OpenEXR 1.x.
• Fix bad bugs in IBA::flatten() and oiiotool --flatten. (#819)
• Fix DPX handling of unsupported pixel types. (#818)
• Fix compilation problems for PowerPC.
• Fix Parameter neglect of proerly copying the m_interp field for assignment and copy construction. (#829)
• Fixes for OpenBSD compilation. (#826/#830)
• DPX: accept pixel ratio (x/0) to mean 1.0, not NaN. (#834)
• Fix ImageBufAlgo::circular_shift (and oiiotool --cshift) that did not wrap correctly for negative shifts. (#832)

Release 1.3.12 (25 Jan 2014 -- compared to 1.3.11)

• Add .sxr and .mxr as possible filename extensions for OpenEXR.
• PNG: add "png:compressionlevel" and "compression" strategy attributes.
• Fix recent build break where OIIO would no longer compile properly against OpenEXR <= 1.6.
• oiiotool --origin could crash with certain large ImageCache-backed images.

Release 1.3.11 (8 Jan 2014 -- compared to 1.3.10)

• DPX output: honor the "Software" metadata attribute passed in.
• OpenEXR: fix crashing bug when reading stringvector attributes in the file.
• Fix build breaks when building against OpenEXR 1.x.
• Fix warnings with Boost Python + gcc 4.8.

Release 1.3.10 (2 Jan 2014 -- compared to 1.3.9)

• OpenEXR fix: multi-part EXR (2.0) didn't write the required "name" attribute for each part.
• iconvert: properly handle multi-image files for formats that can't append subimages.
• iv info window should print native file info, not translated ImageBuf/ImageCache info.
• Improved strutil_test now much more comprehensively unit tests Strutil.
• Strutil::split() fixes bug when maxsplit is not the default value.
• Fix ImageCache::get_pixels() for the chbegin != 0 case, when cache and output buffer types were not identical.
• DPX bug fix -- inappropriate use of "dpx_ImageDescriptor" could make invalid DPX files (especially when reading metadata from one DPX file, changing the number of channels, then writing out again as a DPX file).

Release 1.3 (2 Dec 2013 -- compared to 1.2.x)

Major new features and improvements:

• Huge overhaul of the Python bindings: TypeDesc, ImageSpec (1.3.2), ImageInput, ImageOutput (1.3.3), ROI, ImageBuf (1.3.4), ImageBufAlgo (1.3.6). The Python bindings were pretty rusty, badly tested, undocumented, and had not kept up with recent changes in the C++ APIs. That's all fixed now, the Python APIs are finally first-class citizens (including full functionality, unit tests, and docs), and we intend to keep it that way.
• The ability for an application to supply custom ImageInput and associate them with a file extension. Those II's can do anything, including generate image data procedurally.
• GIF reader

Public API changes:

• Large overhaul of the Python bindings. See the (finally existing!) docs.
• ImageBufAlgo:
  • New functions: nonzero_region(); ociodisplay(), resize() variety that lets you specify the filter by name; 2-argument (non-in-place) versions of add, sub, mul, rangecompress, rangeexpand, unpremult, premult, clamp fixNonFinite; sub() varieties that take float or float* operands.
  • Removed several IBA functions that have been deprecated since 1.2.
  • Deprecated the single-image in-place versions of add, sub, mul, rangecompress, rangeexpand, unpremult, premult, clamp fixNonFinite.
• ImageBuf:
  • read() and init_spec() are no longer required, somewhat simplifying application code that uses ImageBuf. All ImageBuf API calls automatically read the spec and/or pixels from their named file if they are needed, if it has not already been done. (1.3.4)
  • save() is deprecated, and new ImageBuf::write() is now preferred (naming symmetry). (1.3.4)
  • New set_write_format() and IB::set_write_tiles() allow override of default choices for data format and tile size for subsequent calls to ImageBuf::write(). (1.3.4)
• ImageCache / TextureSystem:
  • ImageCache::add_file() lets you seed the ImageCache with a "virtual file" that will read from a custom ImageInput. This lets you add "procedural images" to the IC.
  • ImageCache::add_tile() lets you add tiles to the ImageCache. The caller can initialize those tiles with any pixel values it chooses.
  • A new variety of IC/TS::destroy() takes a 'bool teardown' parameter that, when true, does a complete teardown of the underlying ImageCache, even if it's the "shared" one. (1.3.7)
• OIIO::declare_imageio_format() exposes a way to give OIIO a custom ImageInput and/or ImageOutput (via factory functions) and associate them with particular file extensions. This makes it especially easy for an app to make a procedural image generator that looks to the entire rest of OIIO like a regular image file. (1.3.2)
• TypeDesc::VECSEMANTICS now have additional enum tags for TIMECODE and KEYCODE to indicate that the data represents an SMPTE timecode or SMPTE keycode, respectively. (1.3.7)

Fixes, minor enhancements, and performance improvements:

• oiiotool improvements:
  • --autotrim Shrinks pixel data window upon output to trim black edges. (1.3.2)
  • --siappend Appends subimages of top two images on the stack. (1.2.2)
  • --siappendall Appends ALL images on the stack into a single image with multiple subimages. #1178 (1.6.4)
  • --sisplit Splits the top multi-image into separate images on the stack for each subimage. #1178 (1.6.4)
  • --datadump will print all pixel values of an image (debugging tool) (1.3.6)
  • --flatten turns a "deep" image into a flat one by depth-compositing within each pixel (1.3.6).
  • --ociodisplay applies an OpenColorIO display transformation. (1.3.7)
  • Fix memory leak when processing frame range. (1.2.1/1.3.2)
  • --help now returns a success error code, not a failure. (1.2.1/1.3.2)
  • Fix incorrect help message about --ociolook. (1.2.1/1.3.2)
  • Fix typo in "oiio:Colorspace" attribute name that interfered with correct color space conversion in --colorconvert. (1.2.1)
  • Many fixes and improvements to XMP & IPTC metadata handling. (1.2.2)
  • Multithread speed improvement when opening files by reducing how much time ImageInput::create and/or ImageOutput::create hold a global mutex.
  • oiiotool --origin and --fullpixels, when operating on cropped or overscanned image, could sometimes do the wrong thing. (1.2.2/1.3.3)
  • oiiotool --colorconvert did not work properly when the color transformation was detected to be a no-op. (1.2.2/1.3.3)
  • oiiotool --fit did not handle padding or offsets properly. (1.2.2/1.3.3)
  • Changed/improved the behavior of --rangecompress/--rangeexpand. (1.3.3)
  • 'oiiotool --pattern checker' was incorrect when nonzero offsets were used. (1.2.3/1.3.4)
  • oiiotool --runstats prints the total time/memory on every iteration when doing file sequence wildcard iteration. (1.3.4)
  • Eliminated a particular situation that might hit an ASSERT. Instead, bubble up a real error message. (1.3.4)
  • oiiotool --resize and --resample fixed for overscan images (1.3.5)
  • --ociolook applies OCIO looks. (1.3.6)
  • Supports printf-style frame range wildcards ('%04d') in addition to the '#' style, and scan for matching frames if no explicit framespec is provided. (1.3.6)
• ImageBufAlgo improvements:
  • colorconvert() did not work properly when the color transformation was detected to be a no-op.
  • colorconvert(): added a variety that specifies color spaces by name.
  • New ociolook() function applies OCIO "looks." (1.3.6)
  • checker() was incorrect when nonzero offsets were used.
  • checker() now has default values of 0 for the 'offset' parameters (and so may be omitted if you want 0 offsets). (1.3.4)
  • unsharp_mask() bug when src and dst were different data formats. (1.2.3/1.3.4)
  • Better dealing with cases of IBA functions detecting and issuing errors when inputs that must be initialized are not. (1.3.4)
  • We changed the behavior of rangecompress/rangeexpand. We swear the new way is better. (1.3.3)
  • New nonzero_region() returns the shrink-wrapped nonzero pixel data window. (1.3.2)
  • resize() has a new variety that lets you specify the filter by name (rather than allocating ans passing a Filter2D*).
  • resize() and resample() fixed to more robustly handle overscan images. (1.3.5)
  • over()/zover() are no longer restricted to float images. (1.3.7)
• ImageBuf:
  • ImageBuf::write() writes untiled images by default, fixing some tricky issues when IB's start thinking they're tiled because of interaction with the ImageCache (which makes everything look tiled).
  • ImageBuf::file_format_name() never worked properly, now is fixed (1.3.4)
  • Fixed bug that caused incorrect ImageBuf::copy_pixels() when the two IB's had different data types. (1.3.4/1.2.3)
  • Improved iterator's handling of how overscanned pixels interact with wrap modes. (1.3.6)
  • Fixed a bug with black wrap mode not working correctly. (1.3.7/1.2.4)
• ImageCache/TextureSystem:
  • More careful with texture de-duplication -- texture value lookups use de-duplication, but metadata lookups (e.g., get_texture_info) uses the metadata from the original file.
  • get_image_info/get_texture_info queries for "datawindow" and "displaywindow". (1.3.6)
  • The multi-point version of environment() was broken. (1.3.9/1.4.1)
• maketx: --hicomp uses the new range compression/expansion formula. (1.3.3)
• DPX:
  • support multi-image (often used for stereo frames).
  • Fixed DPX input that didn't recognized offset/cropped images. (1.2.2/1.3.3, another fix in 1.3.4)
  • Fixed DPX output crash with cropped images. (1.2.2/1.3.3)
  • Now correctly get and set "smpte:TimeCode" and "smpte:KeyCode" metadata. (1.3.7).
• OpenEXR:
  • Fixed write_scanlines handling of per-channel data types (1.3.6)
  • Several OpenEXR 2.0 deep file fixes: only some compression types supported, write_tiles passed wrong parameters, must suppress some attribute names. (1.2.3/1.3.6)
  • Now correctly get and set "smpte:TimeCode" and "smpte:KeyCode" metadata. (1.3.7).
• JPEG: fixed that some JPEG files were not being recognized because of magic number issues.
• TGA: Correctly unassociate alpha if it's from an unasociated file; also, always write unassociated data because so few Targa readers in the wild seem to properly handle associated alpha.
• PNG: More correct handling of unassociated alpha.
• TIFF: More correct handling of unassociated alpha.
• PSD: fix handling of associated vs unassociated alpha. (1.2.3)
• maketx fixed to handle inputs that are a mixture of cropped and overscanned. (1.3.5)
• Fix segfault if OCIO is set to a non-existant file. (1.3.6)
• Slight performance increase when writing images to disk (1.3.6)
• Many fixes to make OIIO compile with libc++ (clang's new C++ library, and the default on OSX Mavericks). (1.2.3/1.3.6, 1.3.7)
• Fixed several potential buffer overflow errors from unsafe strcpy. (1.3.8)

Build/test system improvements:

• Fix broken tests under Windows. (1.3.2)
• Many fixes for compiler warnings on various platforms: fmath_test.cpp, field3dinput.cpp, sysutil.cpp, argparse.cpp, oiiotool.cpp. (1.2.1/1.3.2)
• Fixes problems on little-endian architecture with texture3d.cpp. (1.2.1/1.3.2)
• Fix compilation problems on architectures with gcc, but no 'pause' instruction. (1.2.1/1.3.2)
• Fix build search path for correctly finding libopenjpeg 1.5. (1.2.1)
• Work around bug in older MSVC versions wherein Filesystem::open needed to explicitly seek to the beginning of a file. (1.2.1/1.3.2)
• Build fixes for FreeBSD. (1.2.1/1.3.2, 1.2.4/1.3.6)
• Fix testsuite/oiiotool on Windows -- windows shell doesn't expand wildcards. (1.2.1/1.3.2)
• Fix warnings for new GCC 4.8 compiler.
• Always search for and use the release HDF5 libraries, not the debugging ones, even when building debug OIIO (this fixes errors when a system does not have the debugging HDF5 libraries installed). (1.2.2/1.3.3)
• Extensive unit tests in the testsuite for the Python bindings.
• Fix compiler error on MIPS platform. (1.2.2/1.3.3)
• Add FIELD3D_HOME description to 'make help' (1.2.2/1.3.3)
• Add cmake variables ILMBASE_CUSTOM_INCLUDE_DIR, ILMBASE_CUSTOM_LIB_DIR, OPENEXR_CUSTOM_INCLUDE_DIR, and OPENEXR_CUSTOM_LIB_DIR to make it easier to have site-specific hints for these packages' locations. (1.3.4)
• Add BOOST_HOME and OCIO_HOME controls from the top-level Makefile wrapper. (1.3.4/1.2.3)
• Accommodate new cmake release that slightly changes the HDF5 library naming. (1.3.6)
• Various fixes to make the code compile properly with libc++ (clang's rewrite of the C++ standard library). (1.3.6)
• Updated PugiXML (partly to help compilation with libc++) (1.3.6)
• Better support for NOTHREADS (for some legacy systems) (1.3.6)
• Fix to attribute(visibility) for gcc < 4.1.2 (1.3.6)
• Improve the CMake build files to fully quote path constructions to make it more robust for builds with paths containing spaces. (1.3.7)
• Moved the main CMakeLists.txt file to the top level directory, per usual CMake conventions. (1.3.7)
• Fixed timer_test to allow for timing slop of newer OSX versions that have "timer coalescing." (1.6.4)

Developer goodies:

• Docs improvement: full documentation of ImageBufAlgo. (1.2.1/1.3.2)
• Merge improved "Tinyformat" that fixes a bug in some old glibc versions (1.3.2).
• Now each command line tools explicitly converts to UTF native arguments, rather than relying on it happening in ArgParse (which no longer does so). (1.3.2)
• Strutil::contains() and icontains(). (1.2.2/1.3.3)
• Updatd "Tinyformat" to the latest release (1.3.6)
• Sysutil::physical_memory() tries to figure out the total physical memory on the machine. (1.3.6)
• Strutil::safe_strcpy (1.3.8)
• ParamValue now allows get/set of the hidden 'interp' field. (1.3.9/1.4.1)

Release 1.2.3 (1 Nov 2013)

• 'oiiotool --pattern checker' (and ImageBufAlgo::checker) was incorrect when nonzero offsets were used.
• ImageBufAlgo::unsharp_mask() bug when src and dst were different data formats.
• PSD: fix handling of associated vs unassociated alpha.
• Fixed bug that caused incorrect ImageBuf::copy_pixels() when the two IB's had different data types.
• Add BOOST_HOME and OCIO_HOME controls from the top-level Makefile wrapper.
• Several OpenEXR 2.0 deep file fixes: only some compression types supported, write_tiles passed wrong parameters, must suppress some attribute names.
• DPX - several fixes to properly handle images with nonzero origins.
• Fixes for recent cmake not finding HDF5 properly.
• Many fixes to make OIIO compile with libc++ (clang's new C++ library, and the default on OSX Mavericks).
• Fix OpenEXR write_scanlines handling of per-channel data types.
• Upgraded PugiXML to a more modern version (necessary for clean compile with libc++).

Release 1.2.2 (1 Oct 2013)

• New features:
  • New oiiotool --siappend : append subimages of top two images on stack.
  • Utilities: added Strutil::contains() and icontains().
• Fixes:
  • Fixes in handling XMP & IPTC metadata.
  • oiiotool --origin and --fullpixels did not correctly propagate their changes to the output images.
  • oiiotool --colorconvert (and the underlying ImageBufAlgo::colorconvert) could crash if given a color conversion recognized as a no-op.
  • DPX output could crash when writing crop images.
  • DPX input was not recognizing the proper image offset or originalsize.
  • oiiotool --fit wasn't padding correctly or modifying offsets properly.
• Build fixes:
  • Fix compiler error on MIPS platform.
  • Add FIELD3D_HOME description to 'make help'
  • Always use the HDF5 release libraries (for Field3D), not the debug ones.

Release 1.2.1 (5 Aug 2013)

• oiiotool: Fix memory leak when processing frame range.
• Docs improvement: full documentation of ImageBufAlgo.
• oiiotool --help now returns a success error code, not a failure.
• oiiotool: fix incorrect help message about --ociolook.
• oiiotool: Fix typo in "oiio:Colorspace" attribute name that interfered with correct color space conversion in --colorconvert.
• Many fixes for compiler warnings on various platforms: fmath_test.cpp, field3dinput.cpp, sysutil.cpp, argparse.cpp, oiiotool.cpp.
• Fixes problems on little-endian architecture with texture3d.cpp.
• Fix compilation problems on architectures with gcc, but no 'pause' instruction.
• Fix build search path for correctly finding libopenjpeg 1.5.
• Work around bug in older MSVC versions wherein Filesystem::open needed to explicitly seek to the beginning of a file.
• Build fixes for FreeBSD.
• Fix testsuite/oiiotool on Windows -- windows shell doesn't expand wildcards.

Release 1.2 (8 July 2013)

Major new features and improvements:

• New oiiotool commands:
  • --swap Exchanges the top two items on the image stack.
  • --fit Resize image to fit into a given resolution (keeping aspect).
  • --ch Select/cull/reorder/add channels within an image.
  • --chappend Merge two images by appending their color channels.
  • --chnames Rename some or all of the color channels in an image.
  • --zover Depth compositing
  • --cadd Add constant per-channel values to all pixels
  • --cmul Multiply an image by a scalar or per-channel constant.
  • --fillholes Smoothly interpolate for hole filling.
  • --resample Similar to --resize, but just uses closest pixel lookup.
  • --clamp Clamp pixel values
  • --rangeexpand Expand range for certain HDR processing
  • --rangecompress Compress range for certain HDR processing
  • --unpremult Divide colors by alpha (un-premultiply).
  • --premult Multiply colors by alpha.
  • --kernel Make a convolution kernel using a filter name.
  • --convolve Convolve two images.
  • --blur Blur an image.
  • --unsharp Sharpen an image using an unsharp mask.
  • --paste Paste one image on another.
  • --mosaic Create a rectilinear image mosaic.
  • --transpose Transpose an image (flip along the diagonal axis)
  • --chsum Sum all channels in each pixel
  • --cshift Circular shift an image pixels
  • --fft --ifft Forward and inverse Fourier transform
  • --colorcount Counts how many pixels are one of a list of colors.
  • --rangecheck Counts how many pixels fall outside the given range.
  • --ociolook Apply OpenColorIO "looks"
• oiiotool can loop over entire numeric frame ranges by specifying wildcard filenames such as "foo.#.tif" or "bar.1-10#.exr".
• oiiotool --frames and --framepadding give more explicit control over frame range wildcards.
• Significant performance improvements when reading and writing images using the ImageBuf::read and ImageCache::get_pixels interfaces, and in some cases also when using regular ImageInput. This also translates to improved performance and memory use for oiiotool and maketx.
• At least doubled the performance of maketx for large images when run on multi-core machines.
• Significant performance improvements when using ImageBuf::Iterator or ConstIterator to traverse the pixels in an ImageBuf, and the iterators now support "wrap" modes (black, clamp, periodic, mirror).
• maketx --hicomp does "highlight compensation" by compressing the HDR value range prior to inter-MIP resizes, then re-expanding the range.
• Field3D writer (it could read f3d files before, but not write them).
• idiff can now compare that are not the same size (treating pixels beyond the pixel data window is being 0 valued).
• maketx --lightprobe turns a "lightprobe" iamge into a latlong environment map.
• Significant improvements and fixes to EXIF, IPTC, and XMP metadata reading and writing.
• Significant thread scalability improvements to TextureSystem and ImageCache.
• Huge overhaul of functionality, style, and performance of the entire ImageBufAlgo set of functions (see the "Public API changes" section below, and the imagebufalgo.h file for details).

Public API changes:

• ImageOutput semantics change: If the spec passed to open() has spec.format set fo UNKNOWN, then select a default data format for the output file that is "most likely to be able to be read" and/or "most typical for files of that format in the wild." Also, ImageOutput::open() will never fail because a requested data format is unavailable; if the requested format is not supported, a reasonable alternate will always be chosen.
• ImageBuf has been changed to a "PIMPL" idiom, wherein all the internals are no longer exposed in the public API. This allows us to change ImageBuf internals in the future without breaking API or link compatibility (and thus giving us more freedom to backport important improvements to prior releases).
• Overhaul of ImageBufAlgo functions: they all take an ROI parameter; use the DISPATCH macros to make them work with all pixel data types where practical (previously, many supported float only); use Iterator rather than getpixel/setpixel, leading to huge speed improvements; multithread when operating on enough pixels, leading to huge speed improvements; work on 3D (volume) images where applicable; always gracefully handle uninitialized dest image or undefined ROI.
• New ImageBufAlgo functions: channels(), channel_append(), mul(), paste(), zover(), add() and mul() varieties that that add/multiply a constant amount to all pixels, fillholes_pp(), resample(), clamp(), rangecompress(), rangeexpand(), make_kernel(), unsharp_mask(), transpose(), channel_sum(), circular_shift(), fft(), ifft(), color_count(), color_range_check(). [look in imagebufalgo.h for documentation.]
• ImageBufAlgo::make_texture() allows you to do the same thing that maketx does, but from inside an application and without launching a shell invocation of maketx. Two varieties exist: one that takes a filename and reads from disk, another that takes an ImageBuf already in memory.
• ImageBuf Iterator/ConstIterator now take "wrap" mode parameters that allow out-of-range iterators to be able to retrieve valid data. Supported wrap modes include black, clamp, periodic, and mirror. This simplifies a lot of algorithms using IB::Iterator, they can now be written to rely on wrap behavior rather than being cluttered with checks for "if (it.exits())" clauses.
• ImageBufAlgo::computePixelHashSHA1 has been refactored to take ROI, a block size, and thread count, and thus can be parallelized with threads. The block size means that rather than computing a single SHA-1 for all the pixels, it computes separate (parallel) SHA-1 for each group of blocksize scanlines, then returns the SHA-1 of all the individual SHA-1 hashed blocks. This is just as strong a hash as before, thought the value is different than doing the whole thing at once, but by breaking it into blocks the computation can be multithreaded.
• ImageBuf::swap() makes it easy to swap two ImageBuf's.
• ImageSpec::get_channelformats is now const (and always should have been).

Fixes, minor enhancements, and performance improvements:

• TextureSystem improvements:
  • Make sure "black" wrap wins out over "fill" value when they conflict (looking up an out-of-range channel beyond the pixel data window).
  • "mirror" wrap mode was slightly incorrect and has been fixed.
• oiiotool improvements:
  • oiiotool -v breaks down timing by individual function.
  • oiiotool has been sped up by forcing read of the whole image up front for reasonably-sized files (instead of relying on ImageCache).
  • oiiotool does not write output images if fatal errors have occurred.
  • oiiotool --diff: Better error handling, better error printing, and now it can compare images with differing data windows or channel numbers ("missing" channels or pixels are presumed to be 0 for the purposes of comparing).
  • oiiotool --resize (and --fit): properly handle the case of resizing to the same size as the original image.
  • oiiotool -d CHAN=TYPE can set the output for just one channel.
• ImageBufAlgo improvements:
  • Internal overhaul of IBA::resize to greatly speed it up.
  • Improve IBA::resize to handle the image edge better -- instead of clamping, just don't consider nonexistant pixels.
  • More careful selection of filter when resizing (IBA::resize, oiiotool --resize and --fit, and maketx).
  • Fix IBA::paste() error when the foreground image runs off the end of the background image.
• Bug fix when computing SHA-1 hash of 0-sized images.
• Image format support improvements:
  • Bug fix where some format readers (PNM, SGI, and IFF) would leave the file handle opened if the ImageInput was destroyed without calling close() first. Now we guarantee that destroying the II always causes the file to close().
  • DPX: output allocation bug fix; properly set pixel aspect ratio for DPX write.
  • IFF: bug fix for endian swap for IFF file input.
  • JPEG2000: fix warnings, make sure event manager transfer object remains valid.
  • OpenEXR: when reading, was botching the ordering of per-channel data formats.
  • SGI write: bug fix for the case of 15 bpp RLE encoding, was double-swapping bytes.
  • Targa: more robust check for presence of alpha channels; bug fix where R and B channels were reversed for certain kinds of palette images.
  • TIFF: Store the orientation flag properly when outputting a TIFF file.
• maketx improvements:
  • maketx --chnames allows you to rename the channels when you create a texture.
  • maketx bug fixes: incorrect weighting when resizing MIP levels for latlong environment map images that could make visible artifacts on some intermediate MIP levels.
• encode_exif() didn't copy the right number of bytes.
• Python bindings: ImageSpec extra_attribs now properly responds to iterator calls.
• Fix bug in sRGB -> linear conversion.
• iv: make pixelview display coordinates & color even when outside the data window.

Build/test system improvements:

• Many fixes to improve builds and eliminate warnings on Windows and MinGW.
• Fix missing InterlockedExchangeAdd64 for Windows XP.
• New make/cmake boags: OIIO_BUILD_TOOLS=0 will exclude building of the command line tools (just build libraries), OIIO_BUILD_TESTS=0 will exclude building of unit test binaries.
• Improved matching of testsuite reference images on different platforms.
• Lots of fixes to compiler warnings on newer gcc and clang releases.
• Unit tests for Timer class.
• libOpenImageio/imagespeed_test benchmarks various methods of reading and writing files and iterating image pixels (to help us know what to optimize).
• If OpenSSL is available at build time, OIIO will use its SHA-1 implementation instead of our own (theirs is faster). We still fall back on ours if OpenSSL is not available or when OIIO is built with USE_OPENSSL=0.
• Allow default the shared library suffix to be overridden with the CMake variable OVERRIDE_SHARED_LIBRARY_SUFFIX.
• Eliminated all uses of the custom DEBUG symbol, and instead use the more standard idiom "#ifndef NDEBUG".
• Compatibility fixes for Python3.
• MSVC 2008: Prevent a redefinition error when using boost::shared_ptr.
• Fixes for compatibility with libtiff 4.0.
• Fixes for MSVC debug mode having out-of-bound exceptions.
• Fixes for libjpeg 9.x.
• Compile to treat warnings as errors (you can disable this with STOP_ON_WARNING=0).
• New filter: "sharp-gaussian".
• Fix various Windows build errors.
• Improvements to the build when finding IlmBase/OpenEXR.
• Various fixes to compile on ARM architecture.
• Fixes to compile on ESA/390 mainframe (!).
• testtex --threadtimes, --trials, --iters, --nodup, --wedge. These are helpful in using testtext to benchmark the texture system.
• Improvements to make more tests work properly on Windows.

Developer goodies:

• Improved ASSERT and DASSERT macros to not generate warning for certain debug compiles; key their debug behavior by the absence of the standard NDEBUG idiom rather than presence of a custom DEBUG symbol; rename the message variants ASSERT_MSG and DASSERT_MSG.
• Change the default for Sysutil::memory_used to report resident memory rather than virtual process size.
• Multithread/parallel version of utility function convert_image().
• imagebufalgo.h improvements and expansion of the various DISPATCH_* macros.
• New Filesystem utilities: parent_path(), get_directory_entries().
• New Strutil utilities: extract_from_list_string
• spinlock tweaks make it faster than TBB's spin locks!
• By default, we no longer build or use TBB (it's considered deprecated, but in 1.2 can still be turned on with USE_TBB=1).
• In fmath.h, added definitions for safe_inversesqrt, safelog, safe_log2, safe_log10, safe_logb.
• In typedesc.h, added TypeDesc::tostring() function.
• unordered_map_concurrent.h contains a template for a thread-safe unordered_map that is very efficient even for large number of threads simultaneously accessing it.
• Documentation: Finally, a chapter in the PDF docs that fully describes the ImageBuf class.

Release 1.1.13 (24 Jun 2013)

• Texture: make sure wrap mode "black" wins over "fill" value when they conflict.

Release 1.1.12 (20 Jun 2013)

• Fix oiiotool '#' wildcard, was broken on Windows.
• Fix an overflow problem that plagued 'maketx' when running on input larger than 32k x 32k (among other possible failures).

Release 1.1.11 (29 May 2013)

• IFF input: bug in endian swap of 16 bit IFF files.
• oiiotool: fix a minor bug where tiled files were output inappropriately. (Had been patched in master some time ago.)
• fmath.h additions: safe_inversesqrt, safe_log, safe_log2, safe_log10, safe_logb. These are versions that clamp their inputs so that they can't throw exceptions or return Inf or NaN.
• Fix to not incorrectly print ImageCache stats for certain broken files.

Release 1.1.10 (13 Apr 2013)

• IBA::fillholes() and oiiotool --fillholes can smoothly fill in alpha holes with nearby colors. Great for extrapolating the empty areas of texture atlas images so that filtered texture lookups pull in a plausible color at part edges.
• IBA::clamp and oiiotool --clamp clamp pixel values to a scalar or per-channel min and/or max, or clamp alpha to [0,1].
• IBA::rangecompress()/rangeexpand(), and oiiotool --rangecompress / --rangeexpand compress the excess >1 values of HDR images to a log scale (leaving the <= 1 part linear), and re-expand to the usual linear scale. This is very helpful to reduce ringing artifacts that can happen when an HDR image is resized with a good filter with negative lobes (such as lanczos3), by doing a range compression, then the resize, then range expansion. It's not mathematically correct and loses energy, but it often makes a much more pleasing result.
• maketx --hicomp does highlight compression -- automatically doing a range compress before each high-quality resize step, and then a range expansion and clamp-to-zero (squash negative pixels) after each resize.
• DPX - when writing DPX files, properly set the pixel aspect ratio.

Release 1.1.9 (2 Apr 2013)

• IBA::resize and oiiotool --resize/--fit: Bug fixes to resize filter size selection fix artifacts wherein extreme zooms could end up with black stripes in places where the filters fell entirely between samples.
• oiiotool --fit: fix subtle bugs with aspect ratio preservation for images with differing data and display windows; and allow "filter=..." to override the default filter used for fit.
• Resize improvement: fix potential artifacts at the image edges resulting from odd clamping behavior.
• Even more frame range wildcard flexibility with oiiotool --frames and --framepadding options.
• oiiotool --resize and --fit (and the underlying IBA::resize()) have been sped up significantly and are now also multithreaded.

Release 1.1.8 (15 Mar 2013)

• oiiotool --chappend (and ImageBufAlgo::channel_append() underneath) allow you to take two files and concatenate their color channels.
• oiiotool --chnames allows you to rename some or all of a file's color channels.
• oiiotool can loop over entire frame ranges by specifying wildcard filenames such as "foo.#.tif" or "bar.1-10#.exr".
• Cmake: OVERRIDE_SHARED_LIBRARY_SUFFIX allows the shared library suffix to be overridden (e.g., if you need to force .so names on OSX rather than the usual default of .dylib).

Release 1.1.7 (21 Feb 2013)

• Back out dangerous change to thread.h that was in 1.1.6, which could cause performance problems.
• Compile fix for WIN32 in strutil.cpp
• Compile fix for Windows XP - add implementation of InterlockedExchangeAdd64

Release 1.1.6 (11 Feb 2013)

• Fix bug that could generate NaNs or other bad values near the poles of very blurry environment lookups specifically from OpenEXR latlong env maps.
• Fix bug in oiiotool --crop where it could mis-parse the geometric parameter.
• Fix bug in ImageCache::invalidate() where it did not properly delete the fingerprint of an invalidated file.
• Cleanup and fixes in the oiiotool command line help messages.
• New function ImageBufAlgo::paste() copies a region from one IB to another.
• oiiotool --fit resizes an image to fit into a given resolution (keeping the original aspect ratio and padding with black if needed).
• ImageBufAlgo::channels() and "oiiotool --ch" have been extended to allow new channels (specified to be filled with numeric constants) to also be named.
• New function ImageBufAlgo::mul() and "oiiotool --cmul" let you multiply an image by a scalar constant (or per-channel constant).
• Important maketx bug fix: when creating latlong environment maps as OpenEXR files, it was adding energy near the poles, making low-res MIP levels too bright near the poles.
• Fix to "oiiotool --text" and "oiiotool --fill" -- both were incorrectly making the base image black rather than drawing overtop of the previous image.
• Fix FreeBSD compile when not using TBB.
• New oiiotool --swap exchanges the top two items on the image stack.

Release 1.1.5 (29 Jan 2013)

• Bug fix in ImageBufAlgo::parallel_image utility template -- care when not enough work chunks to dole out to all the threads (was previously sending work to threads with nonsensical ROI's, now we just stop when all the regions have been doled out).
• Additional optional argument to IBA::zover that, when nonzero, will treat z=0 pixels as infinitely far away, not super close. You can turn this on from oiiotool with: oiiotool --zover:zeroisinf=1 ...

Release 1.1.4 (27 Jan 2013)

• ImageBufAlgo::make_texture() allows you to do the same thing that maketx does, but from inside an application and without launching a shell invocation of maketx.
• oiiotool now recognizes --metamatch and --nometamatch arguments which cause metadata names matching (or only info NOT matching) the given regular expression to be printed with --info.
• oiiotool --zover does z (depth) composites (it's like a regular "over", but uses the z depth at each pixel to determine which of the two images is the foreground and which is the background).
• ImageBufAlgo::zover() performs z compositing (same as oiiotool --zover).
• ImageBufAlgo::fixNonFinite didn't work properly with 'half' image buffers.
• Performance improvements when reading and writing images.
• Fix error when writing tiled 'float' TIFF images, corrupted output. (Could easily happen when using 'maketx' to convert float images into TIFF textures.)
• Eliminate warnings when compiling with Clang 3.2.
• New CMake variable "USE_EXTERNAL_TBB" can optionally be set to force use of an external TBB library rather than the embedded one.
• Additional testsuite tests (doesn't affect users, but makes bugs easier to catch).
• Fix build problem with SHA1.cpp on some platforms.

Release 1.1.3 (9 Jan 2013)

• Build fix: incorrectly named OpenEXR 2.x files.
• Bug fix in oiiotool --croptofull on OSX
• Build fixes for MinGW on Windows.
• maketx --fullpixels option ignores any origin or display window in the source image, pretending the pixel data is the entire 0-1 image range starting at the origin (useful when the source image is created by an application that incorrectly writes it out as if it were a crop window).
• maketx no longer will clobber existing ImageDescription metadata when it adds SHA-1 hash or other info as it creates the texture.
• Many additional Exif and IPTC tags are correctly recognized.
• maketx and oiiotool recognize and take advantage of IPTC:ImageHistory metadata.

Release 1.1.2 (5 Dec 2012)

• maketx fixes -- was botching creation of textures from source images that were crop windows (pixel window smaller than display window).
• Minor bug fix to Timer when repeatedly starting and restopping (Apple only).
• Bug fix in ustring:find_last_not_of.

Release 1.1.1 (16 Nov 2012)

• Altered the ImageInput::read_scanlines, read_tiles, read_native_scanlines, read_native_tiles, read_native_deep_scanlines, read_native_deep_tiles, and the channel-subset version of ImageSpec::pixel_bytes, so that instead of specifying channel subsets as (firstchan, nchans), they are specified as [chbegin, chend), to match how spatial extents are done, as well as how channel ranges already were specified in ROI and ImageBuf. We hate changing API meanings, but we really think this is better and more consistent. Note that the two common uses of channel subsets were firstchan=0,nchans=nchannels (select all channels) and firstchan=foo,nchans=1, and we have rigged it so that [chbegin,chend) returns the same channels in both of these cases (in the latter case, because we retrieve a minimum of 1 channel), so we believe this is unlikely to break working code in the vast majority of cases.
• OpenEXR: support reading and writing V2f attributes.
• OIIO::getattribute("extension_list") returns a list of all formats supported, and all extensions for each format, in the form: "formatA:ext1,ext2,ext3;formatB:ext4,ext5;..."
• The new ImageCache per-file stats that list numbers of tiles read per MIPmap level have been reformatted slightly, and now print only for files that are actually MIP-mapped.
• New ImageCache::get_pixels() variety that can retrieve a subset of channels.
• Substantial speedup of ImageCache::get_pixels, used to be about 50% more expensive to call IC::get_pixels compared to a direct call to ImageInput::read_image; now is only about 15% more expensive to use the cache.

Release 1.1 (9 Nov 2012)

Major new features and improvements:

• Support for reading and writing "deep" images (including OpenEXR 2.0).
• Big ImageCache/TextureSystem improvements:
  • Improved accuracy of anisotropic texture filtering, especially when combined with "blur."
  • Improve performance in cases with high numbers of threads using the TS simultaneously (mostly due to use of reader-writer locks on the tile cache rather than unique locks).
• New ImageBufAlgo functions:
  • fromIplImage() : converts/copies an OpenCV image to an ImageBuf.
  • capture_image() : captures from a camera device (only if OpenCV is found)
  • over() : Porter/Duff "over" compositing operation
  • render_text() : render text into an image
  • histogram() : compute value histogram information for an image
  • histogram_draw() : compute an image containing a graph of the histogram of another image
  • channels() : select, shuffle, truncate, or extend channels of an image.
• New oiiotool commands:
  • --capture : captures from a camera device (only if OpenCV is found)
  • --pattern constant : creates a constant-color image
  • --over : Porter/Duff "over" compositing operation
  • --text : render text into an image.
  • --histogram : computes an image containing a graph of the histogram of the input image.
  • --fill : fills a region with a solid color
  • --ch : select, shuffle, truncate, or extend channels

API changes:

• A new static ImageInput::open(filename [,config]) combines the old create-and-open idiom into a single call, which is also much more efficient because it won't needlessly open and close the file multiple times. This is now the preferred method for reading a file, though the old-style create() and open() still work as always.
• Deep image support: ImageInput adds read_native_deep_scanlines, read_native_deep_tiles, read_native_deep_image, and ImageOutput adds write_deep_scanlines, write_deep_tiles, write_deep_image, as well as a supports("deepdata") query. Also, a 'deep' field has been added to ImageSpec, and some deep data access functions have been added to ImageBuf.
• Altered the ImageInput::read_scanlines, read_tiles, read_native_scanlines, read_native_tiles, read_native_deep_scanlines, read_native_deep_tiles so that instead of specifying channel subsets as (firstchan, nchans), they are specified as [chbegin, chend), to match how spatial extents are done, as well as how channel ranges already were specified in ROI and ImageBuf. We hate changing API meanings, but we really think this is better and more consistent. Note that the two common uses of channel subsets were firstchan=0,nchans=nchannels (select all channels) and firstchan=foo,nchans=1, and we have rigged it so that [chbegin,chend) returns the same channels in both of these cases (in the latter case, because we retrieve a minimum of 1 channel), so we believe this is unlikely to break working code in the vast majority of cases.
• ImageInput plugins now may supply a valid_file(filename) method which detects whether a given file is in the right format, less expensively than doing a full open() and checking for errors. (It's probably the same cost as before when the file is not the right time, but when it is, it's less expensive because it can stop as soon as it knows it's the right type, without needing to do a full header read and ImageSpec setup.)
• New ImageCache::get_pixels() method that can retrieve a subset of channels.
• Removed various error_message() functions that had been deprecated for a long time (in favor of newer getmessage() functions).
• Define a namespace alias 'OIIO' that gets you past all the custom namespacesin a convenient way.
• TextureOpt now contains a 'subimagename' field that allows subimages to be addressed by name as well as by index (only for multi-image textures, of course).
• ImageBuf improvements:
  • A new constructor allows an ImageBuf to "wrap" an existing buffer memory owned by the calling application without allocating/copying.
  • Renamed the old ImageBuf::copy_pixels -> get_pixels, and it now works for 3D (volumetric) buffers.
  • New ImageBuf::copy(), and eliminated operator= which was confusing.
  • New ImageBuf methods: reres(), copy_metadata(), copy_pixels(), get_pixel_channels().
  • ImageBuf::specmod() allows writable access to the ImageSpec (caution!).
  • Better error reporting mechanism.
  • get_pixels and get_pixel_channels take optional strides.
• ImageBufAlgo changes:
  • Many ImageBufAlgo functions now take a 'ROI' that restricts the operation to a particular range of pixels within the image (usually defaulting to the whole image), and for some operations a range of channels.
  • zero() and fill() take ROI arguments.
  • ImageBufAlgo::CompareResults struct changed the failure and warning counts to imagesize_t so they can't overflow int for large images.
• OIIO::getattribute("format_list") now can retrieve the comma-separated list of all known image file formats.
• OIIO::getattribute("extension_list") returns a list of all formats supported, and all extensions for each format, in the form: "formatA:ext1,ext2,ext3;formatB:ext4,ext5;..."

Fixes, minor enhancements, and performance improvements:

• ImageCache/TextureSystem:
  • Anisotropic texture lookups are more robust when the derivatives are tiny.
  • Attribute "deduplicate" controls whether the identical-image deduplication is enabled (on by default).
  • Attribute "substitute_image" lets you force all texture references to a single image (helpful for debugging).
  • Texture files are no longer limited to having tile sizes that are powers of 2.
  • Much faster TIFF texture access (by speeding up switching of MIPmap levels).
  • More graceful handling of the inability to free handles or tiles under extreme conditions. Rather than assert when we can't free enough to stay within limits, just issue an error and allow the limits to be exceeded (hopefully only by a little, and temporarily).
  • Detailed per-file stats now track the number of tile reads per MIPmap level.
  • Attribute "unassociatedalpha" (when nonzero) requests that IC images not convert unassociated alpha image to associated alpha.
  • Substantial speedup of ImageCache::get_pixels, used to be about 50% more expensive to call IC::get_pixels compared to a direct call to ImageInput::read_image; now is only about 15% more expensive to use the cache.
• iconvert handles the int32 and uint32 cases.
• Bug fix in to_native_rectangle, which could lead to errors in certain data format conversions.
• iv improvements:
  • better behavior after closing the last image of the sequence.
  • file load/save dialogs can filter to show just certain image file types.
  • remember last open dialog directory
  • "About" dialog has a link to the OIIO home page
• Improve ::create to more robustly handle files whose extensions don't match their actual formats.
• OpenImageIO::geterror() is now thread-specific, so separate threads will no longer clobber each others' error messages.
• OpenEXR: support for building with OpenEXR 2.x, including use of multi-part EXR and "deep" data.
• Fix reading bugs in DPX and Cineon.
• DPX: fix endianness problem for 15 bit DPX output.
• PNG: fix handling of gamma for sRGB images.
• oiiotool fixes: print MIP messages correctly (it was only printing for the first MIP level); make sure stray "oiio:BitsPerSample" in an input file doesn't mess up the -d flags.
• Field3D fixes: properly catch exceptions thrown by the Field3D open(); conform metadata to Field3D conventions; multi-layer f3d files will present as a multi-image file with the "oiio:subimagename" giving a unique name for each layer subimage;
• OpenEXR: suppress format-specific metadata from other formats.
• OpenEXR: support reading and writing V2f attributes.
• Targa: fix several bugs that were preventing certain metadata from being written properly.
• TIFF: recognize the SAMPLEFORMAT_IEEEFP/bitspersample=16 as an image composed of "half" pixels; enable PREDICTOR_FLOATINGPOINT to give slightly better compression of float images.
• Handle UTF-8 paths properly on Windows.
• Removed the obsolete "iprocess" utility.
• Fix allocation and stride bugs when dealing with images having different data formats per channel, and tiled images with partially filled border tiles.
• Field3D: Bug fix when reading vector f3d files.
• Significant performance improvements of our atomics and spin locks when compiling with USE_TBB=0.
• Fix quantize() to properly round rather than truncate.
• ImageBufAlgo functions now by convention will save error messages into the error state of their output ImageBuf parameter.
• Improve I/O error checking -- many file reads/writes did not previously have their result status checked.
• Fixed missing OpenEXR open() error message.
• Clean up error reporting in iconvert.
• Fixes to handle Windows utf8 filenames properly.
• ImageBufAlgo::compare() gives a sensible error (rather than an assertion) if the images being compared are not float.
• maketx:
  • Better error messages for a variety of things that could go wrong when reading or writing image files.
  • Fixes for bug preventing certain ImageCache efficiencies.
  • new option --ignore-unassoc leaves unassociated alpha data as it is (no auto-conversion to associated alpha) and/or ignores the tags for an input file that is associated but incorrectly tagged as unassociated alpha.
  • Option --monochrome-detect was buggy for images with alpha.
  • Option --constant-color-detect didn't do anything; now it works.
  • New option: --compression allows you to override the default compresion.
• oiiotool & info: the --hash command had a bug wherein when applied to images there were MIP-mapped, would hash the lowest-res MIP level rather than the highest-res. This could result in two different images, if they happened to have the same average color, to incorrectly report the same SHA-1 hash. Note that this did NOT affect non-MIPmapped images, nor did it affect the SHA-1 hashing that occurred in maketx to allow the TextureSystem to detect duplicate textures.

Build/test system improvements:

• Various Windows build fixes, including fixes for Windows 7, and improvements to running the testsuite on Windows.
• Testsuite additions and improvements: png fmath_test
• Compilation fixes on FreeBSD.
• Compilation fixes on GNU Hurd platform.
• Compilation and warning fixes for Clang 3.1.
• Add FIELD3D_HOME build variable to allow explicit path to Field3D implementation.
• Remove support for Boost < 1.40.
• Improved unit tests for atomics, spin locks, and rw locks.
• Avoid generating iv man pages when USE_QT=0
• New testtex options: --aniso, --stblur
• CMake option 'EXTRA_CPP_DEFINITIONS' lets custom builds inject site-specific compiler flags.
• Make/cmake option: HIDE_SYMBOLS=1 will try to restrict symbol visibility so that only symbols intended to be part of the public APIs will be visible in the library when linked.
• The old DLLPUBLIC and LLEXPORT macros, which could clash with other packages, have been renamed to OIIO_API and OIIO_EXPORT.
• Greatly reduced output when building with cmake; by default, most non-error status messages only are printed when VERBOSE=1 compilation is requested.

Developer goodies:

• Strutil new utilities: iequals, istarts_with, iends_with, to_lower, to_upper, strip, join.
• Use Chris Foster's 'tinyformat' for type-safe printf-like formatting, and this now forms the basis of Strutil::format, ustring::format, and many of the classes' error() methods.
• TypeDesc::equivalent() tests for type equality but allows triples with different' vector semantics to match.
• In timer.h, a new time_trial() template that makes multiple trial benchmarks easy.
• Macros for memory and cache alignment (in sysutil.h).
• Extend Filesystem::searchpath_find() to be able to search recursively.
• Strutil::strip() strips whitespace (or other specified character sets) from the beginning or ending of strings.
• Change threads.h to set USE_TBB=0 if undefined as a compiler flag; this makes it easier to use threads.h in other applications without worrying about TBB at all.
• Windows utf8 filename utilities path_to_windows_native and path_from_windows_native.

Release 1.0.10 (5 Nov 2012)

• ImageCache: more graceful handling of the inability to free handles or tiles under extreme conditions. Rather than assert when we can't free enough to stay within limits, just issue an error and allow the limits to be exceeded (hopefully only by a little, and temporarily).
• ImageCache: Detailed per-file stats now track the number of tile reads per MIPmap level.
• ImageCache attribute "unassociatedalpha" (when nonzero) requests that IC images not convert unassociated alpha image to associated alpha.
• maketx option --ignore-unassoc leaves unassociated alpha data as it is (no auto-conversion to associated alpha) and/or ignores the tags for an input file that is associated but incorrectly tagged as unassociated alpha.
• oiiotool & info: the --hash command had a bug wherein when applied to images there were MIP-mapped, would hash the lowest-res MIP level rather than the highest-res. This could result in two different images, if they happened to have the same average color, to incorrectly report the same SHA-1 hash. Note that this did NOT affect non-MIPmapped images, nor did it affect the SHA-1 hashing that occurred in maketx to allow the TextureSystem to detect duplicate textures.

Release 1.0.9 (4 Sep 2012)

• Improve error messages when trying to open an OpenEXR image that doesn't exist or is not a valid OpenEXR file.
• Make the TextureSystem work properly with MIPmapped images whose tile size is not a power of 2 (mostly back-ported from master, but with additional fixes).

Release 1.0.8 (17 July 2012)

• Fix quantization/truncation bug that sometimes left tiny alpha holes in 8 bit images (making some alpha value that should be 255, instead 254).
• TextureSystem: fix fill_channels for monochrome+alpha images to properly expand to "RRRA."

Release 1.0.7 (8 July 2012)

• Bug fix when reading vector Field3D files.
• Fix input of tiled images with per-channel formats.
• Add testsuite/nonwhole-tiles and testsuite/perchannel.
• Bug fix when reading binary PNM files.

Release 1.0.6 (12 Jun 2012)

• Fix allocation and stride bugs in that could overrun a buffer when reading tiled images whose resolution was not a whole number of tiles.
• Fix stride bugs when reading scanline images with differing data types per channel.
• Fixes for FreeBSD compilation.

Release 1.0.5 (3 Jun 2012)

• Various fixes for FreeBSD/kFreeBSD systems.
• Various fixes to compile with Clang 3.1 without warnings.
• Fixed some DPX and Cineon bugs related to channel names.
• Fixed some mangled text in the PDF documentation.
• Developer goodie: TypeDesc::equivalent() tests two TypeDesc's for equality, but allows 'triples' with differing vector semantics to match.

Release 1.0.4 (2 May 2012)

• DPX fixes for 12 bit DPX and packing methods.
• Cineon fixes: remove buggy 32 and 64 bit output, which wasn't needed; fix for 10 bit -> 16 bit promotion.
• bmp fix: wasn't setting oiio:BitsPerSample correctly.
• oiiotool fixes: improved argument help and add man page generation; print data format info correctly for non-byte bit depths; better inference of output tile size and data format from the inputs (when not explicitly requested); --resize n% was broken; print data format info correctly for non-byte bit depths.
• iinfo fixes: make --stats print correctly; print data format info correctly for non-byte bit depths.
• Fix roundoff error when converting from float buffers to int image files.
• More precise filter normalization in ImageBufAlgo::resize (and therefore oiiotool --resize).

Release 1.0.3 (16 Apr 2012)

• Fix reading bugs in DPX and Cineon.
• iconvert handles the int32 and uint32 cases.
• Bug fix in to_native_rectangle, which could lead to errors in certain data format conversions.
• Various Windows build fixes, including fixes for Windows 7.
• Compilation fixes on FreeBSD.

Release 1.0.2 (19 Mar 2012)

• Fixed TARGA reader bug where for 16-bpp, 4-channel images, we weren't reading the alpha properly.
• Fix ill-formed default output names for maketx (and in the process, add Filesystem::replace_extension utility).
• Threading performance improvement in the texture system as a result of wrapping various internal "iequals" calls to pass a static locale rather than relying on their default behavior that would use a mutex underneath to access a global locale.

Release 1.0.1 (13 Mar 2012, compared to 1.0.0)

Fixes, minor enhancements, and performance improvements:

• Improvements in anisotropic texture filtering quality.
• oiiotool --hash prints the SHA-1 hash of each input image.
• oiiotool: properly print error message and exit when an input file cannot be opened.
• Changed the default behavior of idiff and "oiiotool --diff" to print the pixel difference report only for failures (not for successful matches), unless in verbose (-v) mode. Developer goodies:
• dassert.h: New ASSERTMSG and DASSERTMSG allow even more flexible assertion messages with full printf argument generality.
• Windows compilation fixes.
• Major testsuite overhaul: All tests are copied and run in the build/ARCH/testsuite directory, no longer leaving any clutter in the "source" testsuite area. The testing scripts have been cleaned up and greatly simplified. An individual test can be run using "make test TEST=name" (also works with regular expressions). The usual "make test" will exclude tests that are expected to be broken (such as tests for portions of the system that were not built because their required libraries were not found), but "make testall" will run all tests including nominally "broken" ones.

Release 1.0 (25 Feb 2012, compared to 0.10.5)

Major new features and improvements:

• New ImageInput & ImageOutput methods that can efficiently read/write multiple scanlines or tiles at a time.
• New ImageInput methods that can read a subset of channels from an image.
• WebP format reader/writer.
• PSD (Adobe Photoshop) format reader.
• RLA (Wavefront) format reader/writer.
• Cineon support is re-enabled after various bug fixes.
• New utility: oiiotool. This is still a work in progress, but largely subsumes the functionality of iprocess, iinfo, iconvert, idiff.
• Use OpenColorIO (www.opencolorio.org) for color space conversion, if detected at build time and a valid OCIO configuration is found at runtime. Color conversion commands have been added to oiiotool and maketx.

API changes:

• New ImageInput & ImageOutput methods that can efficiently read/write multiple scanlines or tiles at a time: read_scanlines, read_tiles, write_scanlines, write_tiles.
• New ImageInput methods that can read a subset of channels from an image.
• Change the last couple functions that took min/max pixel range specifications to conform to our usual [begin,end) convention -- write_rectangle and to_native_rectangle.
• exif_encode, exif_decode now available as general utilities (previously were private to the JPEG plugin).
• New ImageOutput::supports() queries: "displaywindow" queries whether the file format is able to handle differing display ("full") and pixel data windows, "negativeorigin" queries whether data origin or full/display origin may be negative.
• TextureSystem and ImageCache now accept attribute "options", that is a comma-separated list of name=value setings (e.g. "max_memory_MB=256,max_files=1000"). Also, upon startup, the environment variables OPENIMAGEIO_TEXTURE_OPTIONS and OPENIMAGEIO_IMAGECACHE_OPTIONS are parsed for these startup values.
• TextureSystem/ImageCache: add a separate "plugin_searchpath" attribute separate from the "searchpath" for images.

Fixes, minor enhancements, and performance improvements:

• ImageBufAlgo new algorithms: compare, compare_Yee, isConstantChannel, fixNonFinite.
• TextureOpt: add ustring-aware versions of the decode_wrapmode utility.
• TypeDesc: allow stream << output.
• iv: raised maximum ImageCache size from 2 GB to 8 GB.
• PNM: fix bug where file exceptions could go uncaught.
• Properly create coefficients for Kodak color transform.
• iprocess: Fix bug calling read.
• maketx new options: --opaque-detect omits alpha from texture whose input images had alpha=1 everywhere; --mipimage option allows custom MIP levels to be assembled; --fixnan repairs NaN & Inf values in the inputs.
• Fixed bugs in sinc and Blackman-Harris filters.
• ImageCache/TextureSystem -- new reset_stats() method resets all the statistics back to zero.
• TIFF: better handling of unexpected bitsperpixel combinations; support the nonstandard use of IEEEFP/16bit as "half"; fix many small bugs related to unusual depth depths and contig/separate conversions.
• JPEG-2000 plugin rewritten to use OpenJpeg library instead of Jasper.
• DPX: various bug fixes.
• RLA plugin overhauled and now has good support for non-8-bit depths.
• oiiotool improvements: --pop, --dup, --selectmip, --origin, --incolorspace, --tocolorspace, --colorconvert.
• TextureSystem supports textures with "overscan" (including proper maketx support for input images with overscan).
• TS/IC invalidate_all previously cleared all fingerprint info, but now only clears fingerprints for individual files that are invalidated (this makes for better duplicate detection).

Build system improvements:

• Support compilation on FreeBSD.
• Improved custom detection of boost-python on Windows.
• Easier to compile OIIO without using TBB.

Developer goodies:

• ArgParse enhancements: make %! indicate a bool that's set to false if the option is found, %@ indicates an immediate callback, allow callbacks for bool options, option matching ignores characters after ':' in the option, wrap lines at word breaks when printing usage help.
• Generate man pages for the command-line tools.
• Strutil additions: escape_chars, unescape_chars, word_wrap.
• Filesystem additions: filename(), extension().
• Sysutil additions: terminal_columns()
• Use github.com/OpenImageIO/oiio-images project for test images that are too big to fit in testsuite.
• Fixed bugs in Timer::lap().
• Aded 'invert' algorithm to fmath.h.
• Clarify Timer docs and fix Apple-specific bug.
• testtex improvements: --wrap

Release 0.10.5 (20 Feb 2012)

• Improvements to anisotropic texture filtering: (1) fix for degenerate derivatives that could corrupt the filter footpring calculations, resulting in an infinitely long major axis; (2) more efficient subpixel filtering for very narrow anisotropic footprints when on the highest-res MIP level.

Release 0.10.4 (November 20, 2011)

• Important texture bug fix: Improve robustness of texture lookups with very small derivatives. The previous bug/misunderstanding had the result of some filter footprints with very small (but valid) derivatives inappropriately using the highest-resolution MIPmap level and maximum anisotropy, resulting in terrible performance, alising, and in some cases visible seams on the boundary between where this happened and where it didn't. Be aware that the fixed code will make some areas of texture look less sharp, but that's only because it was aliasing before and using a totally incorrect MIPmap level.

Release 0.10.3 (November 5, 2011)

• New ImageCache/TextureSystem option: "autoscanline", which, when autotile is turned on, causes the virtual tiles to be the full width of the image scanlines, rather than square. This improves performance for some apps.
• Bug fix: PNG files with both associated alpha and gamma correction lost precision when converting.
• Bug fix: ICO and Targa did not properly force requested (but unsupported) UINT16 output to be UINT8.
• maketx (and Filter classes): fixes to sinc, blackman-harris filters.
• Minor Python binding bug fixes.
• Allow stream << of TypeDesc.
• Fix minor Timer::lap() bug.

Release 0.10.2 (August 6, 2011)

• Improve the performance of ustring constructor when highly multithread.
• Remove old out-of-date Doxygen html pages.

Release 0.10.1 (August 2, 2011)

• Fix TextureSystem::get_texture_info(file,"exists") (and the equivalent for ImageCache), it was previously incorrectly giving an error if the file didn't exist.
• Fixed an error where we were losing the error message if ImageInput::create failed.
• maketx: --hash is deprecated, the SHA-1 hash is always computed; the hash takes into account upstream image changes, such as resizing; the --filter command line argument only takes the filter name, the width is now automatically computed.
• Add static methods to Filter classes allowing queries about the names and vital info about all available filters.
• New Filesystem::is_regular() wraps the boost is_regular and catches exceptions.
• iv: raise the maximum ImageCache settable in the UI from 2GB to 8GB.
• Bug fixes with per-channel data formats.
• Add Strutil::escape_chars() and unescape_chars() utility functions.
• TextureOpt: add ustring-aware versions of the decode_wrapmode() utility.

Release 0.10 (June 9 2010)

Major new features and improvements:

• TextureSystem: fix longstanding texture quality issues: underestimation of anisotropic filter footprint, improved metric for determining when to switch to bicubic filtering, better MIP level selection for non-square images.
• maketx --filter allows you to specify the filter for resizing and downsizing to generate MIPmap levels (this lets you choose a filter that is better than the default "box").
• TextureSystem option "gray_to_rgb", when set to nonzero, promotes grayscale (single channel) texture lookups to RGB (rather than using the fill color for missing channel.
• IFF (Maya) support from Mikael Sundell.

API changes:

• TextureSystem has additional API entry points for apps that want to retrieve an opaque texture handle and per-thread info and then pass it back to texture lookups, saving some name resolution and per-thread retrieval time. (The old routines that do this all automatically still work just fine.)
• New ImageBufAlgo utilities: setNumChannels, isConstantColor, isMonochrome, computePixelHashSHA1, transform.

Fixes, minor enhancements, and performance improvements:

• ImageCache/TextuerSystem:
  • option "accept_untiled" wasn't properly recognized (0.9.1); new attribute "accept_unmipped" (default to 1), when set to zero, will treat any un-MIPmapped file as an error (analogous to the existing "accept_untiled") (0.9.2);
  • fix deadlock when file handles are exhausted (0.9.3); invalidate_all() no longer closes all files unconditionally, only the ones actually invalidated;
  • fix longstanding problem where multiple threads could redundantly open and read the same file if they need it simultaneously and it isn't in cache already;
  • get_pixels issues a single error from a corrupt file, rather than reporting error after error on the same file.
• Texture: Fixes to make latlong environment maps more correct for OpenEXR files, which have some particular unique conventions. (0.9.1); bug fix to TextureOpt default initializer that could screw up texture lookups. (0.9.1)
• maketx fixes: the -oiio command line option also enables hash generation; resize properly if any of the dimensions change (previously only did if ALL dimensions changed) (0.9.3); --nchannels lets you set the number of output channels.
• Added ImageBufAlgo::transform to allow for 'flip' & 'flop' in iprocess. (0.9.1)
• DPX: fix file reading when number of channels not equal to 3 (0.9.3); support for endianness specification, fix lots of problems writing metadata.
• BMP: RGB-to-BGR conversion fixed, force UINT8 output; scanline size was incorrect when copying to temporary buffers.
• JPEG: reader is more robust to corrupted files and other problems.
• JPEG-2000: support files with more than 8 bits per channel.
• Targa: properly expand 5 bit per channel to full bytes.
• Fixed incorrectly set "ResolutionUnit" and "BitsPerSample" usage in several format plugins.
• Improved handling of file formats that allow unassociated alpha.
• iv: display non-Latin filenames properly.
• iconvert --noclobber option ensures that existing files aren't overwritten.
• iinfo: fixes to properly print subimage and mipmap statistics.

For developers / build issues:

• Fix USE_TBB macro on Windows build. (0.9.1)
• Fixes required for Windows compile in conjunction with OSL. (0.9.1)
• Removed some pointless debugging output to the console. (0.9.1)
• Fix subtle bug in convert_type utility function that was causing a slight incorrect rounding when converting float to a signed integer type. (0.9.3)
• Fix to compile properly against Boost 1.46. (0.9.3)
• Update pugixml from 0.5 to 1.0.
• Remove boost::test and gtest as dependencies, use our own macros.
• Fixes to allow use of libtiff 4.0.
• make USE_JASPER=0 USE_FIELD3D=0 make it easy to disable Jasper and Field3D as dependencies.
• Various fixes to make cleaner compiles with clang.
• ustring: Added find* methods that match those of std::string, expose make_unique, is_unique, and from_unique helper functions.
• Add Filesystem::exists and Filesystem::is_directory.

Release 0.9 (Dec 9 2010, updated Feb 23, 2011)

Major new features:

• New format plugin: DPX
• New format plugin: Cineon (currently read only) (r1599,1600,1601,1617)
• New format plugin: Ptex (currently read only) (r1655,1664).
• New format plugin: Field3D (currently read only) (r1659,1666,1669)
• Support for files that are simultaneously multi-image and where each subimage may also be mipmapped (these concepts were previously comingled). This mainly effects ImageInput::seek_subimage and ImageOutput::open, as well as some minor methods of ImageCache and ImageBuf. (r1655,1656,1664,1671)
• Support for per-channel data formats via the new ImageSpec::channelformats vector and interpreting read_foo/write_foo format parameter of UKNOWN as a request for the true native format. (r1674)
• Full support of TextureSystem environment() for lat-long maps.

API changes:

• Single-point texture lookup struct (TextureOpt) and additional single-point texture lookup entry points. (r1679)
• Filter{1D,2D} class now has a destroy() method to match its create(), and create() accepts "bspline" and "catrom" as synonyms for the existing "b-spline" and "catmull-rom" fileters. (r1542)
• Add methods to ImageSpec to read/write an XML representation of the ImageSpec (r1574).
• Finally put all the helper classes (ustring, TypeDesc, etc.) that were in the main OpenImageIO namespace, as well as centralized version numbering and custom namespace control.
• ParamList now has a method to remove attributes.
• Color handling change: color space now is a metadata string, "oiio:ColorSpace", not 'linearity' data member of ImageSpec; remnants of bad 'dither' ideas have been removed; "BitsPerSample" metadata has been renamed "oiio:BitsPerSample" and several bugs have been fixed related to it in some of the image plugins.
• Moved some ImageBuf methods into functions in imagebufalgo.h.

Fixes, minor enhancements, and performance improvements:

• OpenEXR: Allow read/write with different data formats per channel (r1674).
• SGI: add support for files with any number of channels (r1630).
• PNG: improve PNG write speed by 4x by adjusting compression tradeoffs (r1677)
• JPEG: assume sRGB unless EXIF says otherwise (r1693); fix broken JPEG 4-channel to 3-channel conversion (r1696).
• PNM: monochrome data was output incorrectly in both binary & ascii forms; adopt the Netbpm convention for endianness in the 16 bit case; open binary image files in binary mode to avoid newline mangling (r1709).
• TIFF: more sensible checkpointing logic greatly reduces header rewriting.
• iinfo: add --stats option (r1618)
• iv: Now can sort the image list by file date, metadata date, name, or file path (r1514).
• ImageCache: fixed bug that allowed the max_open_files limit to be exceeded (r1657); raise the default IC cache size to 256 MB (r1663); automip unmipped files even if they are tiled (r1670); fix bug wherein an invalidated and modified file would continue to flush in subsequent invalidations, even if the file was not modified again (r1712/0.8.8).
• New ImageBuf algorithm: computePixelStats (r1618)
• Fixes in ImageCache and ImageBuf to allow correct handling of 3D (volumetric) files. (r1659,1660)
• ImageCache fixed to ensure that multiple threads don't try to concurrently open the same file.
• Properly append error messages; ASSERT if the error message buffer exceeds 16 MB (which means somebody is failing to call geterror) (1672)
• Fix subtle Strutil::format and ustring::format crasher bugs with long strings (r1654 - 0.8.8).
• Print the OIIO version in the ImageCache stats so we don't guess when somebody sends us a log file with complaints.
• ImageCache::getattribute can retrieve its interesting internal statistics individually by name. (r1721)
• idiff and iv increased their IC cache size. (r1722)
• idiff bug fixes: (1) files with different number of MIPmap levels immediately failed, whereas they should have compared their top levels, and only fail if the "-a" flag was used; (2) some failure modes incorrectly printed a "PASS" message despite actually failing. (r1722)
• Changed the environment variable that contains the plugin search path from IMAGEIO_LIBRARY_PATH to OPENIMAGEIO_LIBRARY_PATH. (r1723)
• Bug fix to ImageInput::read_image -- could crash due to an internal buffer allocated as the wrong size. (r1724)
• Bug fixes to write_image(), related to subtle stride errors.
• Improved strhash, fewer ustring hash collisions.
• New maketx functionality: --constant-color-detect, --monochrome-detect, --prman, --oiio (look in docs for explanation).

For developers / build issues:

• testtex: print memory use (r1522)
• Embedded plugins are now built within the OIIO namespace, if defined (r1559).
• Fixed implementation of TypeDesc construction from a string. (r1562)
• Incorporate PugiXML for XML parsing/writing needs (r1569).
• In-progress socket I/O plugin is in the code base, but not yet fully supported.
• Disable python support if boost_python is not found. (r1701)

Release 0.8 (May 26 2010)

Major new features:

• Python bindings for the ImageInput, ImageOutput, ImageSpec, ImageBuf, and ImageCache classes.
• New format plugin: SGI image file
• New format plugin: PNM/PPM/PGM/PBM
• New format plugin: DDS (currently reading only)
• New format plugin: Softimage PIC (currently reading only)

API changes:

• New "linearity" tags include AdobeRGB, Rec709, and KodakLog.
• ColorTransfer helper class can convert among the linearity types, and may be optionally passed to convert_image and convert_types.
• Added to fmath.h: sincos, exp2f, log2f
• Renamed ErrHandler::ErrCode enums with EH_ prefix (to fix conflicts with some Windows headers).
• ustring now has getstats() and memory() methods.

Fixes, minor enhancements, and performance improvements:

• ImageInput::create() error messages are more helpful.
• Fixed some error messages in FITS output, iconvert.
• maketx: Console flushes in status messages to that a calling process will get status messages right away.
• Fix subtle ImageCache bug with invalidate().
• ImageCache/TextureSystem have improved multithreading performance when large untiled files are needed simultaneously by many threads.
• TextureSystem: new 'missingcolor' texture option that, when provided, can specify a color that will be used for missing textures rather than generating errors. (If not supplied, missing tex is still an error.)
• BMP plugin enhancements.
• TIFF: support 64-bit float pixels, proper random scanline access emulation for all appropriate compression types, handle incorrectly set-to-zero image_full_width and image_full_height. (r1515 - 0.8.1)
• PNG: properly handle palette images, unassociated alpha, gamma correction, endianness for 16-bit files, and has vastly better memory consumption due to reading scanlines individually rather than buffering the whole image (r1523 - 0.8.1); fix clamping/wrapping problem for certain values when alpha > color. (r1605 - 0.8.3)
• iv fixes: fix improper recentering after image reload; fix crash when image info window opened without any image files loaded; better status window message when image reads fail; iv goes into background properly in Windows; "slide show" mode; pixel view display moves if you need to look at pixels underneath it;
• ImageCache bug: previously couldn't designate a cache > 2GB (because of integer overflow issues).
• ImageCache::get_image_info and TextureSystem::get_texture_info now respond to a new "exists" query that merely tests for existance of the file. (0.8.1)
• ImageCache/TextureSystem fix for a threading logic bug that could potentially lead to a deadlock (and definitely led to hitting a DASSERT when compiled for DEBUG mode). (0.8.1)
• maketx performance improvements: --noresize is now the default (use --resize if you really want power-of-two resizing); much better performance because it doesn't use ImageCache unless the image being converted is very large; takes advantage of multiple cores by automatically multithreading (the number of threads can be controlled by the "-t" option, with the default to use the same number of threads as hardware cores). (r1546 - 0.8.2)
• Fix potential crash in read_tile for files with tiles so big that they would not fit on the stack (heap allocation used instead). (0.8.2)
• OpenEXR: add support for vector metadata attributes. (r1554 - 0.8.2)
• Improve TIFF open error messages. (r1570 - 0.8.3)
• Make ImageCache::get_pixels() and TextureSystem::get_texels() safe for crop windows -- fill with zero outside the valid pixel data area. (r1579 - 0.8.3)
• In ImageCache::attribute (and by extension, TS::attribute), only invalidate the cache if the attributes actually CHANGED. (r1582 - 0.8.3)
• maketx: --checknan option double checks that no source image pixels are NaN or Inf (r1584 - 0.8.3).
• Fixed crash that could result from certain XML strings embedded in TIFF headers (uncaught exception). (0.8.5)
• Fixed ImageCache deadlock when using autotile. (r1631 - 0.8.6)
• Fixed a longstanding performance issue with ImageCache automip, wherein an unmipped file that is larger than the cache size leads to pathological thrashing. The solution is to automatically raise the cache size to be large enough to automip the file without danger of thrashing. (r1657 - 0.8.7)

For developers / build issues:

• EMBEDPLUGINS=1 is now the default. This means that all the format plugins that come with OIIO are compiled into the main library, so there's no reason for users to set $IMAGEIO_LIBRARY_PATH unless they need custom format plugins not supplied with the main distribution.
• Fix compiler warnings (mostly under Windows): TBB stuff, ustring, windows.h.
• Option to build static libraries (with 'make LINKSTATIC=1').
• Fixes to make clean compilation with gcc-4.4.2.
• Allow custom 'platform' designation in the build.
• Allow custom installation destination ('make INSTALLDIR=...').
• ustring now takes half the memory (by no longer redundantly storing the characters on Linux and OS X).
• Always use TBB (better performance on Windows for atomics). [0.8.2]

Release 0.7 (Nov 26 2009)

Major new features:

• New format plugin: JPEG-2000 (r1050)
• New format plugin: FITS (r1287 et al)
• TextureSystem: two new entries to TextureOptions which allow the texture system to return the derivatives in s and t of the texture. (r1308)

API changes:

• Added imagespec() method to ImageCache and TextureSystem that returns a reference to the internal ImageSpec of the image. This is much more efficient than get_imagespec, but beware, the pointer is only valid until somebody calls invalidate() on the file. (r1266)
• TextureOptions: eliminated the 'alpha' field. Added the dresultds and dresultdt fields.
• Extend TypeDesc to include INT64 and UINT64. (r1145)

Fixes, minor enhancements, and performance improvements:

• Make EMBEDPLUGINS=1 the default. (0.7.1)
• Improvements to the Targa plugin, bringing it into compliance with TGA 2.0 (r1163, r1297)
• Fixed PNG-related crashes on 64 bit machines. (r1336)
• iv improvements: support for multichannel images and different color modes (r1129), support auto use mipmap level based on zooming (r1093), correct pixelview for rotated images (r1092), fix off-by-one error with some zoom levels (r1089).
• maketx: fixed problem where it was sometimes not setting the output data format to match the input data format correctly (r1290), fixed problems with writing EXR files with --nomipmap (r1286), fixed cases where data window was not the same as display window (i.e. crop or overscan).
• ImageCache/TextureSystem: various threading and performance improvements. (r1188, r1211, r1288, r1299)
• TS: fixed incorrect "texturetype" results of get_texture_info. (r1314)
• IC/TS: fixed crasher bugs when doing get_pixels of images that had non-zero data window origin. (r1313)
• IC/TS: better error messages and recovery from spooky open and read_tile failures. (r1321)
• When IC/TS reads and entire (untiled) image, the file is closed afterwards. This is especially helpful on Windows where open files are locked to writing by other processes. (r1298)
• HUGE speedup of ImageCache::get_image_info (and TS::get_texture_info) b replacing strcmp's with ustring == (r1281).
• IC: fixed various subtle logic errors with broken files and invalidate/invalidate_all. (r1252, r1279)
• IC/TS: fixed memory leak of per-thread imagecache data and subtle race conditions. (r1057, r1216, r1222, r1238)
• TS: fixed problem where missing or broken textures weren't using the right fill color. (r1268)
• IC: Clamp cache size to a reasonable lower limit (r1256)
• TS: improvements to filter estimation (1134) and bicubic interpolation numerical stability and speed (r1166, r1179, r1333).
• IC: when autotile=0 but automip=1, fixed bug that was wasting HUGE amounts of memory by using the wrong resolution for mip levels! (r1147)
• IC: fix an edge case where tiles could leak. (r1044)
• Fixed some hairy static initialization problems with ustring (r1280)
• Use a spin lock rather than block in ustring constructor gives HUGE speedup especially on Windows. (r1167)
• TS: Make everything work for textures whose image origin is not (0,0) or whose pixel data window doesn't match the image window (i.e. crop windows or overscan). (r1332)
• IC/TS: Correctly invalidate files afected by recently changed "automip" setting. (r1337)
• IC/TS: fix crash that could occur with non-existant textures in combination with invalidate_all(). (r1338)
• Make create() error messages more helpful. (0.7.1)

For developers:

• Build more easily when older OpenEXR versions are found. (r1082)
• HTML Doxygen documentation on the public APIs. (r1311, r1312, et al)
• Sysutil::this_program_path finds the full path of the running program. (r1304)
• Better compiler-side error checking of printf-like functions (r1302)
• A new site/... area where important users with local build customization needs can check in (reasonably sized) custom makefiles or other helpful things. (r1284)
• New ErrorHandler class, currently unused by OIIO itself, but very handy. (r1265)
• Fixed lots of compiler warnings.
• Upgraded to a more recent TBB, which fixed some atomic problems. (r1211)
• ustring: make string comparison safe for empty strings. (r1330)
• Include file fixes for gcc 4.4. (r1331)
• Regularize all #include references to Imath and Openexr to <OpenEXR/blah>. (r1335)

Release 0.6 (Jul 20, 2009)

Major new features:

• Everything has been ported to Windows.
• iv: handle older cards or versions of OpenGL, including lack of GLSL, non-pow2 textures, etc. Generally should now be usable (if slightly degraded functionality) for most OpenGL 1.x implementations. (r764)
• ImageBuf that only reads images is now automatically backed by ImageCache. In the process, add Iterator and ConstIterator as "safe" and efficient ways to visit all the pixels within a region of the image, and eliminate the unsafe pixeladdr() method. Also added ImageCache::attribute("forcefloat") to conveniently force all ImageCache internal storage to be float. (r770,771,772,775,803,805)
• iv can now support "big" images, in particular larger than the OpenGL texture limit (4k), and also very big images via the use of ImageCache (r912).
• Truevision Targa (TGA) support. (r776,792)

API changes:

• In a variety of places that specified pixel rectangles (including ImageCache::get_pixels and TextureSystem::get_texels), specify regions as (xbegin,xend,ybegin,yend) rather than (xmin, ymin, xmax, ymax). Note that 'end' is, like STL, one past the last pixel. (r771)
• All classes now query error messages using geterror(). Previously some used geterror() and others used error_message(). The old error_message is deprecated and will be removed in a future release (r957).

Fixes and minor enhancements:

• OpenEXR plugin improvements: don't set "textureformat" attribute unless it really is a mip-mapped texture. Preserve the mipmap rounding mode when copying OpenEXR files, by using the "openexr:roundingmode" metadata (r801). Properly mark the alpha and z channels in the ImageSpec (r885).
• TIFF plugin improvements: handle 2 bpp images, properly name channels when reading palette images (r802), no longer uses the PREDICTOR_FLOATINGPOINT, since older versions of libtiff can't read those files (r752). Properly set the Exif sRGB marker (r888).
• BMP plugin improvements: allows top-down scanlines as well as bottom-up, correctly reads 4-, 8- and 24-bit images that have scanlines padded to 4-byte boundaries.
• ImageBuf algorithms: crop, add (r892).
• EXPERIMENTAL: 'iprocess' utility that lets you do some simple image processing operations (r892).
• ImageCache additional statistics: file open time (r743), alert if mip-mapped images are accessed at only their highest-res level (r743). Properly emulates random access reads of LZW-compressed files (r920).
• iv: fix problems displaying images whose width was not a multiple of 4 bytes (r767), when loading small images, the window starts out a usable minimum size, iv always raises the window upon first opening, fix pixelview of alpha in RGB images (r939).
• iv: Fix off-by-one error that drew the last scanline incorrectly sometimes (r1089). Give feedback when doing a slow repaint (r1089).
• iv improvements: fix skew-like problems with Intel cards, fix non-GLSL texture mapping, limit texture size to 4096^2 to keep GL memory use reasonable make "Reload" work again after breaking a few patches ago (r1090).
• maketx: in the case where the input texture was already float and needed no pow2 rounding, we didn't get the tiling or other metadata right (r824)
• ImageCache and TextureSystem do a better job of reporting low-level ImageInput errors up the chain (r945).
• ImageCache: new option "accept_untiled", when set to zero, will reject untiled images (r979).
• 'maketx --hash' embeds a SHA-1 fingerprint of the source image's pixels in the texture file header's "ImageDescription" field. ImageCache (and TextureSystem) will recognize these and eliminate redundant I/O when it finds multiple files with identical pixels. (r741,742)
• iinfo: eliminate --md5 in favor of --hash (computing SHA-1). (r749)
• Fix ImageCache and TextureSystem to have thread-specific error reporting. (r1045)
• TextureSystem: fixed subtle bug in destruction order that could double-free per-thread data. (r1057)
• ImageCache: now get_image_info("format") returns teh native data format of the file. (r1058)
• maketx: properly handle input files where the data window is not the same as the display window or if the image offset was nonzero. The correct semantics are that the DISPLAY window is what maps to [0,1] in texture space. (r1059)

For developers:

• Lots of fixes for Windows compilation (r754, r860)
• A build option for whether or not to use TBB for atomics. (r780)
• New test suite entries: tiff-suite, tiff-depths (r787,788), openexr-suite, openexr-multires, openexr-chroma (r789,790,791).
• New unit tests for ImageBuf::zero, ImageBuf::fill, ImageBufAlgo::crop (r891).
• Reorganization of unit tests.
• Improvements to ArgParse internals and interface.
• All the macros that prevent double-inclusion of header files have had their names changed from FILENAME_H to OPENIMAGEIO_FILENAME_H so that they don't conflict with other package (r967).
• Reorganized test suite hierarchy.
• Optionally allow the entire library to be enclosed in a versioned namespace (via 'make NAMESPACE=foo') .
• Upgraded to a more recent version of TBB that seems to have fixed some bugs with atomic counters. (r1027)

Release 0.5 (31 May 2009)

Features:

• New image format plugins: zfile (r529), ICO (r579,585,588,619,637), BMP (reads only) (r580,584,614,625)
• Support for multiple subimages in iinfo (r607), iconvert, idiff (r631),
• ImageCache and TextureSystem: better stats (r528, r717), bug fixes for large untiled images (r558,561), anisotropic improvements, stats improvements, thread safety improvements (r566), invalidate/invalidate_all (r591), better error reporting (r606), thread safety fixes (r650), fix problem when filter size was precisely at a mipmap level it blurred to higher level (r687), avoid problems when blur > 1 and there is no 1x1 mip level (r687).
• maketx: --shadow (r530), --nomipmap (r531), big speedups (r699).
• idiff: add RMS error and PSNR (r622).
• OpenEXR plugin: support "openexr:lineOrder" attribute so random-tile-order files may be written (r569).
• API: better handling of huge images that could have sizes > 32 bits (r575)

Fixes and minor enhancements:

• iinfo: fix - lack of help message when no files specified (r513).
• maketx: make -u work properly (r517), wasn't honoring --separate (r532).
• iconvert: add --separate and --contig (r535).
• TIFF plugin: work around error in old versions of libtiff for IPTC packets (r674).
• JPEG plugin: if linearity is sRGB, set Exif:ColorSpace correctly (r536)
• iv: more robust to certain OpenGL versions (r550), support for OpenGL versions that don't support non-pow2 textures (r563), correct texture mapping when GL_NV_texture_rectangle is the best texture mapping extension we can find (r572).
• idiff: refactored to use ImageBuf internally (r541)

For developers:

• Switch to CMake for builds.
• Build enhancements: 'make USE_OPENGL=0' (r512), better handling of certain system OpenGL headers (r512), more robust with Qt location (r542), handle older Boost 1.35 (r574).
• Tests: test_libOpenImageIO (r581), ico (r621),
• More work towards clean windows compilation (r659,672).

Release 0.4 (15 Mar 2009 - not formally released)

(compared to the 'initial' developer release of 1 Sep 2008)

Features:

• Lots of work on docs.
• API changes:
  • Replaced ParamBaseType/ParamType with TypeDesc.
  • ImageSpec: add full_{x,y,z} fields.
  • Changed ImageInput/ImageOutput create(), open(), and suports() to take std::string instead of char* (r297)
  • Added ImageOutput::copy_image (r428)
  • TypeDesc - distinguish COLOR from NOXFORM. (r466)
  • ImageInput:open(name,newspec,config). (r482)
• igrep utility searches metadata of images (r447,455,499)
• iconvert: add --caption, --keyword, --clear-keywords, --adjust-time --attrib, --inplace (r484,488,491), --compression (r354), --quality (r362).
• iv: put into background after launch unless -F arg (r240), alt-leftmouse zooms, handle sRGB correctly, GAMMA env variable, full HDR for half and float (r243), honor full/display window versus data window (r300), better view re-centering behavior (r355), fix orientation bugs (r363,380,381).
• TextureSystem: single point texture lookups (r247), have all routines return a bool giving error status, rename gettextureinfo -> get_texture_info, add get_imagespec, get_texels, geterror (r252,265), replace hard-coded get/set routines with generic attribute/getattribute (r321), accept non-tiled and non-mipped textures (r317,319,388,389,390), separate the image cache into a separate ImageCache class that may be used independently of TextureSystem (r326,327,393), better statistics including per-file stats (r333,360,375,429), invalidate method (r460).
• TIFF plugin: read/write EXIF, IPTC IIM, and IPTC XPM/XML data (r406,407,456,458)
• JPEG plugin: read/write IPTC IIM, XMP, and GPS metadata (r408,411,458,461), implement ImageOutput::copy_data() can copy images without altering pixel values (r483).

Fixes and minor enhancements:

• ImageBuf: add option to read() that allows data format conversion (r244), add oriented{x,y} and oriented_full_{width,height} methods (r296).
• TextureSystem: fix bicubic filetering (r309), big memory savings by not having libtiff use memory mapping (r332), lots of performance tuning (r351), anisotropic texture improvements (r364), bug fixes for search paths (r459).
• iinfo: print color space and file format info (r241), better printing of matrix metadata (r365), new options -f, -m (r501).
• idiff: bug fix - not producing difference image (r402)
• maketx: deduce default file format from extension (r275).
• All format plugins: better error detection in open() for senseless resolutions (r294,295)
• OpenEXR plugin: handle float as well as half data, fixes when image origin is not (0,0) (r291), fix leak of exr writer (r292), conform to common conventions for camera matrix naming (r367), regularize capitalization of metadata (r412)
• TIFF plugin: bug fix for combination of tile + separate (r304), fixes to retrieval of matrix tags (r366)
• HDR plugin: emulate random access of scanlines (r387), better error reporting (r451).
• JPEG plugin: respect "CompressionQuality" (r361), emulate random access of scanlines (r387), properly read & write JPEG_COM marker for comments (r403), assume sRGB unless the metadata say otherwise (r414).

For developers:

• Preliminary work on Windows port (r398,399)
• Include all the needed .h files in the dist area (r251)
• Handle older gcc (r273), older boost (r301,431), older OpenEXR (r301), older libtiff (r432).
• 'make EMBEDPLUGINS=1' compiles the bundled plugins right into main library (r302).
• Put header files in dist/ARCH/include/OpenImageIO (r303), rename src/libimageio -> src/libOpenImageIO (r382).

Initial developer release 0.1 (1 Sep 2008):

• ImageInput, ImageOutput, TextureSystem APIs pretty mature
• Plugins: TIFF, JPEG/JFIF, OpenEXR, PNG, HDR/rgbe
• iv - basic display, multiple images, menus, status bar, info window, basic prefs window, pixel view tool, zoom, pan, open, open recent, close, save as, view subimages, view channels, gamma, exposure, fit window to image, fit image to window, full screen.
• iconvert
• idiff
• maketx
• API docs for ImageInput, ImageOutput, writing plugins
• Linux and OSX