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https://issues.apache.org/jira/browse/PDFBOX-2156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14040109#comment-14040109
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Tilman Hausherr commented on PDFBOX-2156:
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Fixed in rev 1604562 for the 1.8 version for shading types 4 and 5.
Surprisingly, the method of shading 2 and 3 (which involves the pageHeight and
the y-translation) can't be used here.
> different shading patterns at different resolutions when ctm is null
> --------------------------------------------------------------------
>
> Key: PDFBOX-2156
> URL: https://issues.apache.org/jira/browse/PDFBOX-2156
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 1.8.5, 1.8.6, 2.0.0
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Labels: shading, shadingpattern
> Attachments: pattern-shading-2-4-noMatrix.pdf,
> swftools-gradients.pdf, swftools-gradients1.jpg
>
>
> The attached file renders incorrectly except at 72dpi; at other resolutions,
> there are different results that get worse as the resolution gets higher. For
> shading types 2 and 3, this effect happens only in the 1.8 versions, not in
> the 2.0 version. For shading types 4 and up, it happens in both 1.8 and 2.0.
> The reason is that the transformation is incomplete if the ctm is null.
> I found the file here and it was created by Matthias Kramm:
> https://github.com/jdapena/swftools/tree/master/spec
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