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https://issues.apache.org/jira/browse/PDFBOX-5074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17261849#comment-17261849
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Tilman Hausherr commented on PDFBOX-5074:
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We get the "correct" results when using the alternative colorspace. However the
PDF specification tells "Conforming readers need not use the alternateSpace and
tintTransform parameters, and may instead use custom blending algorithms, along
with other information provided in the attributes dictionary if present" and
that is our implementation. I looked at the source code of PDF.js and my
impression is that they use the AlternateCS and tintTransform parameters only.
The use DeviceN like the Separation colorspace.
> Incorrect color
> ---------------
>
> Key: PDFBOX-5074
> URL: https://issues.apache.org/jira/browse/PDFBOX-5074
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.22
> Reporter: Tilman Hausherr
> Priority: Major
> Attachments: PDFBOX-5074.pdf, PDFBOX-5074_2.pdf
>
>
> Reported by Esteban Ruiz on the mailing list. Color should be between white
> (0) and green (1), but is between black and green.
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