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https://issues.apache.org/jira/browse/PDFBOX-3000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15798694#comment-15798694
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Tilman Hausherr edited comment on PDFBOX-3000 at 1/4/17 4:46 PM:
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Re the last commit: I've mentioned before that the softmask handling of pixels
outside of the box is wrong, but when I corrected it lots of files were
rendered poorly (see comment on Dec 10, 2016). The file
PDFJS-6967_reduced_outside_softmask.pdf shows why: that one has a softmask that
is empty because it is outside of everything, see
{{Root/Pages/Kids/\[0]/Resources/XObject/Fm0/Resources/ExtGState/GS0/SMask/G/BBox}}.
Instead of using the /bc value, Adobe just ignores it. So we'll ignore empty
softmasks (which is also the old behaviour in softmask.java for pixels
outside). But non empty softmasks that cover only a part of a group now won't
be ignored, from now on the /bc value will be used. The
gs-bugzilla689309-reduced--bc files show this.
was (Author: tilman):
Re the last commit: I've mentioned before that the softmask handling of pixels
outside of the box is wrong, but when I corrected it lots of files were
rendered poorly (see comment on Dec 10, 2016). The file
PDFJS-6967_reduced_outside_softmask.pdf shows why: that one has a softmask that
is empty because it is outside of everything. Instead of using the /bc value,
Adobe just ignores it. So we'll ignore empty softmasks (which is also the old
behaviour in softmask.java for pixels outside). But non empty softmasks that
cover only a part of a group now won't be ignored, from now on the /bc value
will be used. The gs-bugzilla689309-reduced--bc files show this.
> 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-2182_mod.pdf, PDFBOX-3400-RGB.pdf,
> PDFBOX-3494_reduced.pdf, PDFBOX-3494_reduced_cropX.pdf, PDFBOX-3564-Mask.pdf,
> PDFBox3359PanelTestEnhanced.java, PDFJS-2845-p1.pdf,
> PDFJS-5811-2-p3_reduced.pdf, PDFJS-5811-2-p3_reduced4.pdf,
> PDFJS-5811-2-p4_reduced-rotations.pdf, PDFJS-5811-2.pdf,
> PDFJS-5853_reduced.pdf, PDFJS-6967_reduced_outside_softmask.pdf,
> circle-simple.pdf, ds-firewall-enterprise-p1_reduced.pdf,
> gs-bugzilla689309-reduced-bc0.pdf, gs-bugzilla689309-reduced-bc1.pdf,
> gs-bugzilla689309-reduced.pdf, gs-bugzilla691157.pdf,
> gs-bugzilla691157_mod_unc.pdf, gs-bugzilla691157_mod_unc.png,
> gs-bugzilla691348.pdf, gs-bugzilla692217_reduced.pdf,
> gs-bugzilla693322_reduced.pdf, gs-bugzilla694556-3.pdf,
> gs-bugzilla695354.pdf, gs-bugzilla695582-transparency-fill-stroke.pdf,
> gs-bugzilla695582-transparency-fill-stroke.pdf-1.png,
> samsung_galaxy_s_4_um-p1_reduced.pdf, snowman-nose-gradient-rgb.pdf,
> snowman-nose-gradient-rgb_reduced-0.6-bad2.pdf,
> snowman-nose-gradient-rgb_reduced-0.7-good2.pdf,
> snowman-nose-gradient-screenshot-comparison-11.12.2016.jpg,
> snowman-nose-gradient.pdf, snowmen-opacity-clipping-masks-2.0.3.png,
> snowmen-opacity-clipping-masks-2.1-SNAPSHOT-10.12.2016.png,
> snowmen-opacity-clipping-masks-2.1.0-SNAPSHOT-2016-12-07.png,
> snowmen-opacity-clipping-masks-adobe-illustrator.png,
> snowmen-opacity-clipping-masks.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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