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https://issues.apache.org/jira/browse/PDFBOX-3000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15552699#comment-15552699
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Tilman Hausherr commented on PDFBOX-3000:
-----------------------------------------
I found only AIS being false. True would be "alpha is shape". The specification
tells:
{quote}
Shape values of 0.0 and 1.0 identify points that lie outside and inside a
conventional sharp-edged object; intermediate values are useful in defining
soft-edged objects.
Shape and opacity are conceptually very similar. In fact, they can usually be
combined into a single value, called alpha, which controls both the colour
compositing computation and the fading between an object and its backdrop.
However, there are a few situations in which they shall be treated separately;
see 11.4.6, "Knockout Groups."
{quote}
I doubt that we have the skills to properly handle knockout groups after having
seen the Dr. Bärfuss video :-(
> Transparency Group issues
> -------------------------
>
> Key: PDFBOX-3000
> URL: https://issues.apache.org/jira/browse/PDFBOX-3000
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.0
> Reporter: John Hewson
> Fix For: 2.1.0
>
> Attachments: 007087-payment-due-p58_reduced2.pdf,
> PDFBOX-1697-reduced-rotations.pdf, PDFBOX-3400-RGB.pdf,
> PDFBOX-3494_reduced.pdf, PDFBox3359PanelTestEnhanced.java, PDFJS-2845-p1.pdf,
> PDFJS-5811-2-p4_reduced-rotations.pdf, gs-bugzilla693322_reduced.pdf,
> samsung_galaxy_s_4_um-p1_reduced.pdf, softmask-rewrite-alt1.patch,
> softmask-rewrite.patch
>
>
> This is a follow-up issue for transparency group issues from PDFBOX-2423.
> More details to come.
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