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https://issues.apache.org/jira/browse/PDFBOX-3000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15551033#comment-15551033
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Tilman Hausherr commented on PDFBOX-3000:
-----------------------------------------
{quote}
The calculation of the alpha value was wrong. It must not be premultiplied but
simply be copied to the alpha channel.
{quote}
As a test, I modified softmask.java like this (and passed the softmask):
{code}
if (COSName.ALPHA.equals(softMask.getSubType()))
{
rgba[3] = gray[0];
}
else
{
rgba[3] = Math.round(rgba[3] * (gray[0] / 255f)); // multiply alpha
}
{code}
However this resulted in bad rendering (much black) of
- evince-bug431088.pdf
- gs-bugilla691763.pdf
- gs-bugzilla689439-alphamask.pdf
- gs-bugzilla693322.pdf
> 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, 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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