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  1. PDFBox
  2. PDFBOX-1223

Strange color issues with convertToImage method

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      Description

      While testing PDFBox I noticed a few strange color issues when converting the first page of an pdf to an image using the method convertToImage on a PDPage. An example pdf and resulting png is attached for each case.

      • Case 1: Most of the colors seem to get inverted.
      • Case 2: The green color of the area in the top right is paler the the original, and the text under the logo at the bottom right is quite "pixely"
      • Case 3: The blue area under the text is missing
      • Case 4: The red area should be semi-transparent (so the rose stem can be seen behind it), not solid.

      I compared all resulting images with how the pdf looks in Foxit Reader 5.1 on Windows 7.

      This is the code I used:

      ---------
      PDFParser parser = new PDFParser(new FileInputStream(pdfInputFile));
      parser.parse();
      PDDocument document = parser.getPDDocument();
      List<PDPage> pages = (List<PDPage>)document.getDocumentCatalog().getAllPages();

      if (pages.size() > 0) {
      PDPage page = pages.get(0);
      BufferedImage image = page.convertToImage(BufferedImage.TYPE_INT_RGB, 300);
      ImageIO.write(image, "png", pngOutputFile);
      }
      ---------

      If there is some change I can do in my code or some configuration to improve some of these issues, then I would love to hear about it. As a comparison, Ghost4j (with Ghostscript underneath) can handle these cases better. Even the text under the logo in case 2 was less "pixely", with the same resolution.

        Attachments

        1. case1.pdf
          3.31 MB
          Jimi Hullegård
        2. case2.pdf
          2.87 MB
          Jimi Hullegård
        3. case3.pdf
          3.55 MB
          Jimi Hullegård
        4. case1.png
          951 kB
          Jimi Hullegård
        5. case2.png
          1.23 MB
          Jimi Hullegård
        6. case3.png
          1.45 MB
          Jimi Hullegård
        7. case4.png
          389 kB
          Jimi Hullegård

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              • Assignee:
                lehmi Andreas Lehmkühler
                Reporter:
                jimi.hullegard Jimi Hullegård
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                • Created:
                  Updated:
                  Resolved: