Shape transparency not respected when exporting to image
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Key: PDFBOX-975
URL: https://issues.apache.org/jira/browse/PDFBOX-975
Project: PDFBox
Issue Type: Bug
Reporter: Jesse Eichar
Attachments: pdfbox-transparency.zip
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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