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Problem: Images rendered from PDF pages are hard to read and sometimes have issues #1792

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mcantelon opened this issue Apr 2, 2024 · 1 comment · Fixed by #1793
Closed

Problem: Images rendered from PDF pages are hard to read and sometimes have issues #1792

mcantelon opened this issue Apr 2, 2024 · 1 comment · Fixed by #1793
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Type: bug A flaw in the code that causes the software to produce an incorrect or unexpected result.
Milestone
2.8.2

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@mcantelon
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mcantelon commented Apr 2, 2024 •
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Current Behavior

Steps to reproduce the behavior

Here are the steps needs to enable the setting, upload a PDF, then navigate to the corresponding image of a PDF page:

  1. Navigate to settings/uploads.
  2. Change the "Upload multi-page files as multiple descriptions" setting to "Yes".
  3. Click the "Save" button.
  4. Navigate to informationobject/addand add an information object.
  5. Once you've created the information object then, for the "More" select menu, select "Link Digital Object".
  6. Click "Choose file", select a multi-page PDF file, then click the "Create" button.
  7. Click the preview image for one of the PDF's pages to navigate to that page's corresponding information object.
  8. Click on the PDF page's representation image.
  9. The full PDF page image will be displayed.

Example PDFs, provided by Dan, that don't render optimally:

Expected Behavior

Rendered pages should be legible.

Possible Solution

Argument sent to invocation of the "convert" tool can fix.

Context and Notes

AtoM has a setting that allows PDFs, uploaded as digital objects to information objects, to be "exploded" into child information objects, for each of the PDF's pages, with each information object having a digital object attached that's an image rendered from the PDF page.

Version used

2.8.2 - 193

Operating System and version

Ubuntu 20.04

Default installation culture

en

PHP version

PHP 7.4

Contact details

[email protected]
@mcantelon mcantelon added the Type: bug A flaw in the code that causes the software to produce an incorrect or unexpected result. label Apr 2, 2024
mcantelon added a commit that referenced this issue Apr 2, 2024
@mcantelon
Fix PDF page image rendering issues (#1792)
4e659b6
mcantelon added a commit that referenced this issue Apr 2, 2024
@mcantelon
Fix PDF page image rendering issues (#1792)
46fbed5 
Added new CLI options to command used to extract images of PDF pages.
Added "-density 300" to increase image detail and "-alpha remove" to
fix issue where the alpha channel is rendered as black and causes
images to be illegible.
mcantelon added a commit that referenced this issue Apr 3, 2024
@mcantelon
Add PDF page D.O. support to regen. task (#1792)
025ed55 
Fixed issue with the digital objects regeneration task
(digitalobject:regen-derivatives) deleting, but not regenerating,
digital objects representing PDF pages.

Removed unneeded and unused digital object class method.
mcantelon added a commit that referenced this issue Apr 3, 2024
@mcantelon
Fix PDF page image rendering issues (#1792) (#1793)
753044f 
Added new CLI options to command used to extract images of PDF pages.
Added "-density 300" to increase image detail and "-alpha remove" to
fix issue where the alpha channel is rendered as black and causes
images to be illegible.
@mcantelon
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Merged PR to fix this.

@anvit anvit linked a pull request May 16, 2024 that will close this issue
Fix PDF page image rendering issues (#1792) #1793
Merged
@anvit anvit added this to the 2.8.2 milestone May 16, 2024
@anvit anvit closed this as completed May 16, 2024
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Type: bug A flaw in the code that causes the software to produce an incorrect or unexpected result.
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Milestone
2.8.2
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Fix PDF page image rendering issues (#1792) artefactual/atom
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