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https://issues.apache.org/jira/browse/PDFBOX-4900?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tilman Hausherr reassigned PDFBOX-4900:
---------------------------------------
Assignee: Tilman Hausherr
> 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
> Assignee: Tilman Hausherr
> Priority: Major
> Fix For: 2.0.21, 3.0.0 PDFBox
>
> 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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