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Add keep_rgb option when saving JPEG to prevent conversion of RGB colorspace #7553

Merged
merged 6 commits into from
Jan 1, 2024
Merged

Add keep_rgb option when saving JPEG to prevent conversion of RGB colorspace #7553

merged 6 commits into from
Jan 1, 2024

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bgilbert
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@bgilbert bgilbert commented Nov 14, 2023 •
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libjpeg automatically converts RGB to YCbCr by default. Add a keep_rgb option to disable libjpeg's automatic conversion of RGB images during write.

@radarhere radarhere added the JPEG label Nov 14, 2023
@radarhere radarhere changed the title Allow writing RGB JPEGs Added keep_colorspace option when saving JPEG to prevent conversion of RGB colorspace Nov 14, 2023
@bgilbert bgilbert marked this pull request as draft November 25, 2023 21:10
@bgilbert bgilbert changed the title Added keep_colorspace option when saving JPEG to prevent conversion of RGB colorspace Added keep_rgb option when saving JPEG to prevent conversion of RGB colorspace Nov 25, 2023
@bgilbert bgilbert changed the title Added keep_rgb option when saving JPEG to prevent conversion of RGB colorspace Add keep_rgb option when saving JPEG to prevent conversion of RGB colorspace Nov 25, 2023
@bgilbert bgilbert marked this pull request as ready for review November 25, 2023 21:34
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Rebased (first push) and switched to keep_rgb (second push).

@radarhere radarhere mentioned this pull request Nov 27, 2023
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radarhere
radarhere previously approved these changes Nov 27, 2023
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radarhere
radarhere reviewed Nov 27, 2023
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Tests/test_file_jpeg.py Outdated Show resolved Hide resolved
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Added @radarhere's test improvements from bgilbert#3.

homm
homm reviewed Dec 4, 2023
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homm
homm reviewed Dec 4, 2023
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@radarhere radarhere dismissed their stale review December 4, 2023 12:54

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@bgilbert bgilbert mentioned this pull request Dec 8, 2023
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bgilbert and others added 3 commits December 13, 2023 18:26
@bgilbert
Add keep_rgb option to prevent RGB -> YCbCr conversion during JPEG write
4b422db 
libjpeg automatically converts RGB to YCbCr by default.  Add a keep_rgb
option to disable libjpeg's automatic conversion of RGB images during
write.
@radarhere @bgilbert
Rearranged subsampling assertions
f90827d
@bgilbert
Clarify JPEG tests for default/invalid subsampling
1414673 
-1 is the default; 3 is invalid and should behave the same as the default.
@bgilbert
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Rebased onto current main and added release note.

@bgilbert
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Is anything else needed here?

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Applied suggestions.

bgilbert and others added 2 commits December 26, 2023 12:37
@bgilbert
Fail if chroma subsampling selected when writing RGB JPEG
a5fab5f 
The user presumably doesn't intend to subsample the green and blue
channels.
@bgilbert @radarhere
Add release note for JPEG keep_rgb option
e2018a6 
Co-authored-by: Andrew Murray <[email protected]>
nulano
nulano approved these changes Dec 27, 2023
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@radarhere radarhere merged commit d93a5ad into python-pillow:main Jan 1, 2024
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@bgilbert bgilbert deleted the jpeg-rgb branch January 1, 2024 18:56
@radarhere radarhere mentioned this pull request Jan 2, 2024
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@nulano nulano nulano approved these changes

@homm homm homm approved these changes

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@bgilbert @akx @homm @hugovk @radarhere @nulano @Yay295