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  1. PDFBox
  2. PDFBOX-4655

ImageIOUtil.WriteImage creates huge PNG images when used with default quality on jdk11

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      [~tallison@apache.org] pointed us to a build failure in Tika on jdk11. The cause may be different .PNG files - I noticed that PNG files saved with ImageIOUtil.write() are huge when done with default quality on jdk12 / 13, which is 1. In the past (jdk8 and before) that parameter had no effect for PNG files but apparently no more.

      Thus I'll set compressionQuality to 0 to ensure maximal compression. PNG is a lossless format so there is no risk.

      Todo:

      • use flexible default value
      • mention in Javadoc
      • change command line tool PDFToImage
      • change one test

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            • Assignee:
              tilman Tilman Hausherr
              Reporter:
              tilman Tilman Hausherr
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