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https://issues.apache.org/jira/browse/PDFBOX-4095?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16352676#comment-16352676
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Tilman Hausherr commented on PDFBOX-4095:
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All the advanced ops are tricky... if you haven't already, watch this video:
https://www.youtube.com/watch?v=TiqDqd-1pwU .
And then some blendmodes don't work properly against the page background (I
mentioned this somewhere in PDFBOX-3000, search for "unmarked space").
> Non Separable Blend Modes implementation(HUE, SATURATION, COLOR, LUMINOSITY)
> ----------------------------------------------------------------------------
>
> Key: PDFBOX-4095
> URL: https://issues.apache.org/jira/browse/PDFBOX-4095
> Project: PDFBox
> Issue Type: Improvement
> Components: Rendering
> Affects Versions: 2.0.8
> Reporter: savan patel
> Priority: Major
> Attachments: BlendComposite.java.patch, BlendMode.java.patch,
> COSName.java.patch, blendmodes.pdf, gs-bugzilla690477.pdf,
> gs-bugzilla697433-1.pdf
>
>
> I have a patch for implementation of non separable blend modes...
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