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https://issues.apache.org/jira/browse/PDFBOX-2681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14320842#comment-14320842
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Jon Wu commented on PDFBOX-2681:
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IANAL. I take "this agreement" to mean the entire license agreement that we're
reading since "this agreement" is used consistently throughout - even before
section 1 begins.
Bummer, yes that last part seems limiting on redistribution.
I wonder if Adobe would grant consent to include the profile since their intent
seems to be to help ensure everybody can see the same colors consistently:
"Adobe wants to enable consistent, high-quality color workflows. For color
workflows to succeed, color information must be shared by many people, from
original creator to final publisher. For this reason, we are supplying our ICC
profiles as a free download for graphics professionals to use across their
workflows."
However, given that getting that done seems hard and using but not
redistributing the profiles seems fine - it's easy enough to just swap in the
profile for internal use. Glad that does the job for me and I'm fine with that
small inconvenience.
> Colors inaccurate rastered CMYK source w/ gradient + photo
> ----------------------------------------------------------
>
> Key: PDFBOX-2681
> URL: https://issues.apache.org/jira/browse/PDFBOX-2681
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.0
> Environment: Tested on OS X 10.10, Java 1.6 / 1.8
> Reporter: Jon Wu
> Attachments: Shading2Function2CMYK.pdf, Shading2Function2CMYK.ps,
> acrobat-vs-pdfbox-swop.png, gradient-test-illustrator.jpg,
> gradient-test-pdfbox.jpg, gradient-test-photo-illustrator.jpg,
> gradient-test-photo-pdfbox-us-web-coated-swop-v2.jpg,
> gradient-test-photo-pdfbox.jpg, gradient-test-photo-rgb-illustrator.jpg,
> gradient-test-photo-rgb-pdfbox.jpg, gradient-test-photo-rgb.pdf,
> gradient-test-photo.pdf, gradient-test.pdf, purple-gradient-comparison.jpg
>
>
> In the attached gradient-test-photo.pdf, there's a photo with a gradient on
> top of it. The colors in the gradient are CMYK. When rasterizing this test
> file with PDFBox 2.0.0 SNAPSHOT 20150209, the resulting image's gradient is
> different from the original and the colors of the photo under the gradient
> look significantly different vs the display in Adobe tools like Illustrator
> or other compliant PDF readers.
> Issues:
> - Color hue is wrong. Is this a CMYK to RGB issue?
> - Opacity of gradient is wrong and much different. The jpg from Illustrator
> shows much more of the photo without a gradient over it.
> Without a photo, there's still a difference, but it's much harder to see.
> Example in gradient-test.pdf where the same gradient is drawn over a grey
> rectangle.
> If I convert the PDF to RGB in Illustrator first and rasterize the RGB PDF
> with PDFBox, the result is nearly identical between Illustrator and PDFBox so
> this seems like a CMYK conversion issue in both the general color conversion
> and maybe how the gradient is calculated.
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