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https://issues.apache.org/jira/browse/PDFBOX-5872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17876045#comment-17876045
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Tilman Hausherr commented on PDFBOX-5872:
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{quote}However, it doesn't appear that there is any real reliance on raster
support in PDFBox (at least in version 3){quote}
{{readRaster()}} is called for CMYK images. Wouldn't it be better to have your
modified method as a separate private method just for JPX?
> Support imageio-jnr / imageio-openjpeg library for JPEG2000 decoding
> --------------------------------------------------------------------
>
> Key: PDFBOX-5872
> URL: https://issues.apache.org/jira/browse/PDFBOX-5872
> Project: PDFBox
> Issue Type: Improvement
> Components: Rendering
> Affects Versions: 3.0.3 PDFBox
> Reporter: Gábor Stefanik
> Priority: Major
>
> [https://github.com/dbmdz/imageio-jnr] /
> [https://mvnrepository.com/artifact/de.digitalcollections.imageio/imageio-openjpeg]
> is an alternative JPEG2000 implementation for Java ImageIO that uses the
> native OpenJPEG library as its backend.
> Unfortunately, it doesn't work out of the box because it doesn't implement
> raster reading (canReadRaster not overridden, returns false), and PDFBox uses
> canReadRaster() to validate image reader instances. However, it doesn't
> appear that there is any real reliance on raster support in PDFBox (at least
> in version 3) - if I patch the library to lie about raster support, it seems
> to work perfectly.
> A further complication arises when the OpenJPEG native library cannot be
> found: imageio-openjpeg returns null as the reader instance, which causes PDF
> rendering to fail with an NPE, even if another JPEG2000 reader is available.
> This can be remedied with a simple null check.
> [https://github.com/apache/pdfbox/pull/197] shows a possible solution. Until
> then, [https://github.com/Googulator/imageio-jnr] can be used with PDFBox
> 3.0.3 as a workaround, so long as the native library is correctly installed.
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