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https://issues.apache.org/jira/browse/PDFBOX-975?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jesse Eichar updated PDFBOX-975:
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Attachment: transparency.patch
Patch that fixes the export problem. It does not add transparency to the
overal PDF API. It just allows pdfs that contain the transparent object
already to be exported to an image while maintaining the transparency of shapes.
> Shape transparency not respected when exporting to image
> --------------------------------------------------------
>
> Key: PDFBOX-975
> URL: https://issues.apache.org/jira/browse/PDFBOX-975
> Project: PDFBox
> Issue Type: Bug
> Reporter: Jesse Eichar
> Labels: patch, pdf, pdfbox, transparent
> Attachments: pdfbox-transparency.zip, transparency.patch
>
>
> When a pdf file has a shape that is drawn with a transparency value the
> transparency values are not respected when exported to image.
> I have attached a small patch that fixes this issue. The patch does not
> fully satisfy the PDF transparency model, for example only Alpha composition
> is used. But it covers the most common use-case of drawing shapes with a
> transparency value for fill and stroke.
> I have also attached a maven project that demonstrates the issue. It had a
> pdf with a shape in it that is semi transparent. Running the application
> (execute the runexample.sh script) will load that pdf and export it as an
> image. During the export (the output is a file called pdfAsImage) the
> transparency is lost.
> Compare the exported image and the original pdf to see the difference. PDF
> is in src/main/resources/...
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