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https://issues.apache.org/jira/browse/PDFBOX-2104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14014207#comment-14014207
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Petr Slaby commented on PDFBOX-2104:
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[~jahewson]: It seems that you are right. The methods of this class do not get
called anyway and using a BufferedImage with BufferedImage.TYPE_BYTE_GRAY
produces the same result. At least with this document, I will test with my full
test suite on Monday when I am back in the office. I will also check whether a
java.awt.image.ColorConvertOp would be a better choice for the RGB to gray
scale conversion done here.
Have a nice weekend.
> 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
> Attachments: 000001_MTEXT_CS6.pdf, 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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