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https://issues.apache.org/jira/browse/PDFBOX-4655?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andreas Lehmkühler closed PDFBOX-4655.
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> ImageIOUtil.WriteImage creates huge PNG images when used with default quality
> on jdk11
> --------------------------------------------------------------------------------------
>
> Key: PDFBOX-4655
> URL: https://issues.apache.org/jira/browse/PDFBOX-4655
> Project: PDFBox
> Issue Type: Bug
> Components: Utilities
> Affects Versions: 2.0.17
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Priority: Major
> Labels: imageio, jdk11, jdk12, jdk13, png
> Fix For: 2.0.18, 3.0.0 PDFBox
>
>
> [[email protected]] 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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