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https://issues.apache.org/jira/browse/PDFBOX-3858?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tilman Hausherr resolved PDFBOX-3858.
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Resolution: Fixed
> Optimize 1 component DeviceN colorspace
> ---------------------------------------
>
> Key: PDFBOX-3858
> URL: https://issues.apache.org/jira/browse/PDFBOX-3858
> Project: PDFBox
> Issue Type: Bug
> Components: PDModel, Rendering
> Affects Versions: 2.0.6
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Labels: devicen
> Fix For: 2.0.7, 3.0.0
>
> Attachments: DeviceNcs.png
>
>
> I received a file (confidential) that has an image with a 1 component DeviceN
> colorspace that maps (through a long type 4 function) to a CMYK colorspace.
> Rendering takes over 20 minutes. The reason is that for each pixel, first
> the type 4 (PostScript) function must be calculated, then the CMYK value must
> be converted to RGB.
> Solution: cache the inputs and the results when the DeviceN colorspace has
> only 1 component. Rendering time goes down to a few seconds.
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