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https://issues.apache.org/jira/browse/PDFBOX-2104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14040662#comment-14040662
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Leonard Rosenthol commented on PDFBOX-2104:
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If you don't implement the color management part of transparency groups
correctly - you won't get the correct results. Also be aware that as part of
the work on PDF 2.0, the committee is actually CLARIFYING (and changing)
certain parts of the transparency model that will be rolled back to 32K-1.
> Implement transparency groups
> -----------------------------
>
> Key: PDFBOX-2104
> URL: https://issues.apache.org/jira/browse/PDFBOX-2104
> Project: PDFBox
> Issue Type: Improvement
> Components: Rendering
> Affects Versions: 2.0.0
> Reporter: Petr Slaby
> Assignee: John Hewson
> Labels: transparency
> Fix For: 2.0.0
>
> Attachments: 000001_MTEXT_CS6.pdf, TransparencyGroups.1.patch,
> TransparencyGroups.2.patch, TransparencyGroups.3.patch,
> TransparencyGroups.patch
>
>
> The attached PDF uses transparency groups, blending and soft masks to create
> the rounded corners and shades behind images. It appears that these features
> are not implemented in PDFBox. An implementation proposal is attached in the
> TransparencyGroup.patch. The basic idea is to create a buffered image, draw
> the transparency group content onto it and then use the result to produce the
> soft mask or draw the image on the original g2d.
> Note: I am not the (only) author of the proposed change. It was developed in
> our company few years ago in sources based on a 1.7.x version of PDFBox,
> mostly by a guy who already left. Over the years, merging of the work done in
> PDFBox main stream into our source base has become impossible due to many
> refactorings and other deep going changes done. Now we would like to go the
> opposite way - where possible - bring the changes and fixes we have done into
> PDFBox main stream and start to use it in our installations.
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