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Posted to dev@pdfbox.apache.org by "Tilman Hausherr (JIRA)" <ji...@apache.org> on 2017/07/07 16:21:01 UTC
[jira] [Resolved] (PDFBOX-3858) Optimize 1 component DeviceN
colorspace
[ https://issues.apache.org/jira/browse/PDFBOX-3858?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tilman Hausherr resolved PDFBOX-3858.
-------------------------------------
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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