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https://issues.apache.org/jira/browse/PDFBOX-3105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15002529#comment-15002529
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ASF subversion and git services commented on PDFBOX-3105:
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Commit 1714100 from [~tilman] in branch 'pdfbox/trunk'
[ https://svn.apache.org/r1714100 ]
PDFBOX-3105: apply mask only if /ImageMask true
> Image with mask missing in rendering
> ------------------------------------
>
> Key: PDFBOX-3105
> URL: https://issues.apache.org/jira/browse/PDFBOX-3105
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 1.8.10, 1.8.11, 2.0.0
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Fix For: 2.0.0
>
> Attachments: PDFJS-6621-reduced.pdf, PDFJS-6621.pdf,
> PDFJS-6621_pink.pdf
>
>
> {quote}The png logo shows up in other pdf readers but not in pdf.js{quote}
> And we have the same problem. And GS too.
> The file is broken.
> I get the "bad" effect in Acrobat Reader if I insert "/ImageMask true" in the
> mask. If I set it to false then the rendering is good. This leads me to the
> conclusion that this part of the spec is to be taken literally: "However, if
> the image dictionary's ImageMask entry is true, the sample data shall be
> interpreted as a stencil mask for applying the graphics state's nonstroking
> colour parameters (see 8.9.6.2, "Stencil Masking")." i.e. that if /ImageMask
> isn't there or is false, the mask is to be ignored.
> This can be confirmed by a trick: at the beginning of the content stream,
> change "1 1 1 rg" (white) to "1 0 1 rg" (pink). Display with Adobe Reader,
> the white square is there. If masking had been working, only the seal would
> be seen without a white square.
> If your eyes are good, you can see the dirt below the seal, which can also be
> seen in the unedited PDF. If the masking had been working, the dirt wouldn't
> be seen.
> So for PDFBox, I'll simply change to apply the mask only if /ImageMask true.
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