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https://issues.apache.org/jira/browse/PDFBOX-4900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17146852#comment-17146852
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Tilman Hausherr commented on PDFBOX-4900:
-----------------------------------------
I suspect that this one will need some major work, although I'll be able to
make a workaround for this file. The problem is that our code returns RGB
values everywhere, not ARGB. Before that, I'll search our files to see whethere
there are any with this colorspace and "None".
> PDFBox Rendering of PDF Page incorrect when using the special None Named
> Separation
> -----------------------------------------------------------------------------------
>
> Key: PDFBOX-4900
> URL: https://issues.apache.org/jira/browse/PDFBOX-4900
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.19
> Environment: Windows Linux
> Reporter: Andrew Daykin
> Priority: Major
> Attachments: ImageMagic_TwoCircles_NS-None.png,
> PDFBox_TwoCircles_NS-None.pdf-1.png, TwoCircles_NS-None.pdf, TwoCircles_NS.pdf
>
> Original Estimate: 336h
> Remaining Estimate: 336h
>
> Setting a Named Separation to "None" is a way of creating an ink should be
> ignored by the rendering application. This doesn't happen in PDFBox as it
> appears to use the CMYK representation when displaying the PDF in the
> debugger and when it creates a rendered png file.
> i.e.
> BufferedImage bim = pdfRenderer.renderImageWithDPI(page, 300, ImageType.RGB);
>
> Other applications (Acrobat, ImageMagick etc.) render the output correctly.
>
> The attached PDF FIle illustrate this.
>
> TwoCircles_NS.pdf was created in Adobe Illustrator and saved as PDF without
> compression. It uses a couple of named separations NS_1 and NS_2.
>
> TwoCircles_NS-None.pdf is the same PDF content but the names of the name
> separations have both been set to "None" - This was done in a HexEditor but
> in practice it is done via PDFBox.
>
> PDFBox_TwoCircles_NS-None.pdf-1.png is the result of the PDFBox Render to PNG
> which doesn't appear to follow the PDF Spec. and the definition of None when
> used as a named separation.
>
> ImageMagic_TwoCircles_NS-none.png is the output from "magick convert -density
> 150" which appears to be correct/gives the desired result.
>
>
>
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