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https://issues.apache.org/jira/browse/PDFBOX-4627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16912331#comment-16912331
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Michael Klink commented on PDFBOX-4627:
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{quote}I read PDF Reference fifth edition and I didn't find exactly the
sentence mentioned by Michael Klink{quote}
I quoted from the PDF specification ISO 32000-1, not the non-normative
precursor references.
I have to admit, though, that in ISO 32000-2 one detail changed: the
*"otherwise, an error occurs"* has been replaced by a *"otherwise, the operator
is ignored and processing of the stream continues without error"*.
Thus, a PDF-2.0 compliant PDF processor here is expected to act different, more
lenient.
> Wrong color of uncolored tiling pattern
> ---------------------------------------
>
> Key: PDFBOX-4627
> URL: https://issues.apache.org/jira/browse/PDFBOX-4627
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.16
> Reporter: Jiri Kunhart
> Priority: Major
> Attachments: after_fix.png, before_fix.png,
> uncolored_tiling_pattern.patch, uncolored_tiling_pattern.pdf
>
>
> The attached pdf file with uncolored tiling pattern is rendered wrongly (see
> "before_fix.png"). The problem is that pattern stream contains
> /DevGrayCS cs
> which overwrites PDPattern color space stored in
> PDGraphicsState#nonStrokingColor. I did a small fix which ignores all
> settings of color space inside of uncolored tiling pattern stream and the
> result seems to be good (see "after_fix.png").
> Note: the pattern in the png file looks diferently than in the original pdf
> file, but this should be handled probably in the other issue.
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