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  1. PDFBox
  2. PDFBOX-975

Shape transparency not respected when exporting to image


    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 1.6.0
    • Component/s: None


      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/...


        1. pdfbox-transparency.zip
          190 kB
          Jesse Eichar
        2. transparency.patch
          5 kB
          Jesse Eichar



            • Assignee:
              lehmi Andreas Lehmkühler
              jeichar Jesse Eichar
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