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https://issues.apache.org/jira/browse/PDFBOX-2934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14909770#comment-14909770
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Andreas Lehmkühler commented on PDFBOX-2934:
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Unfortunately it doesn't have anything to do with the used color spaces. It
depend on the fact if the transparency group has a soft mask or not and which
blend mode has to be used.
For now, I've no idea how to solve that.
> Support smask /S /Alpha
> -----------------------
>
> Key: PDFBOX-2934
> URL: https://issues.apache.org/jira/browse/PDFBOX-2934
> Project: PDFBox
> Issue Type: Task
> Affects Versions: 2.0.0
> Reporter: Tilman Hausherr
> Attachments: PDFBOX2934_softmask.patch, PDFJS-1710-p1.pdf,
> PDFJS-1710-p1.pdf-1-better.png, PDFJS-1710-p1.pdf-1.png, PDFJS-1710-p7.pdf,
> PDFJS-1710-p7.pdf-1-better.png, PDFJS-1710-p7.pdf-1.png,
> PDFJS-5526-p11-13.pdf, gs-bugzilla689439-alphamask.pdf
>
>
> The smask feature /S /Alpha is either not implemented or not working at all.
> I have two files that are wrongly rendered with the current software, and
> correctly rendered when the feature is disabled \(!\). As a first step, I am
> disabling it for now and attach test files. Johns proposed patch has also
> disabled the feature, so I think we can agree on that.
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