[jira] [Updated] (PDFBOX-1996) PDSeparation optimization

["Andreas Lehmkühler (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PDFBOX-1996?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andreas Lehmkühler updated PDFBOX-1996:
---------------------------------------
    Fix Version/s: 2.0.0

> PDSeparation optimization
> -------------------------
>
>                 Key: PDFBOX-1996
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-1996
>             Project: PDFBox
>          Issue Type: Improvement
>          Components: Rendering
>    Affects Versions: 2.0.0
>            Reporter: Dave Smith
>            Priority: Minor
>             Fix For: 2.0.0
>
>         Attachments: pdfbox.patch, pdfbox.patch
>
>
> I have a 4 page black and white pdf that takes 32 seconds (8 seconds a page) to render. It uses a Separation color space and it has to run numerous functions per pixel that is causing the slow down. I have a patch where I pre calculate the black and white pixels and cache them instead of calculating them every time. This optimization gets the page rendering down to less than a second a page. I will attach my patch. I could see going forward caching all calculated colours , but floats in hash maps are tricky.



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