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https://issues.apache.org/jira/browse/PDFBOX-5370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17484367#comment-17484367
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Andreas Lehmkühler commented on PDFBOX-5370:
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It was just a crazy idea, but it somehow targets two aspects of the issue. The
one about the blending [~tilman] already mentioned earlier and the one about
inverting the colour values in some or all cases
> DeviceN/NChannel Seperation fails for rgb
> -----------------------------------------
>
> Key: PDFBOX-5370
> URL: https://issues.apache.org/jira/browse/PDFBOX-5370
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.25, 2.0.26, 3.0.0 PDFBox
> Reporter: Maruan Sahyoun
> Priority: Major
> Attachments: NChannel-Pantone-1.BMP, NChannel-Pantone-1.PNG,
> NChannel-Pantone.bmp, NChannel-Pantone.pdf, NChannel-cmyk-1.BMP,
> NChannel-cmyk-1.PNG, NChannel-cmyk.bmp, NChannel-cmyk.pdf,
> NChannel-rgb-1.BMP, NChannel-rgb-1.PNG, NChannel-rgb.bmp, NChannel-rgb.pdf,
> NChannel-rgb2.pdf, Patch_PDFBOX-5370.txt, image-2022-01-29-10-51-18-421.png,
> image-2022-01-29-10-51-44-286.png, image-2022-01-30-13-46-16-080.png
>
>
> The files NChannel-xx.pdf use different color modes for separation which is
> described in chapter 10.8.3 of the PDF spec. The matching .bmp files show
> the expected results. The -1.BMP and -1.PNG files show the results generated
> by PDFBox trunk (2.0 is the same result).
> As can be seen the results for cmyk and Pantone are fine/close with the rgb
> rendering failing.
> The PDFs and expected results have been provided by Hans Bärfuss, PDF Tools
> AG. Thank you for contributing the samples.
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