[jira] [Created] (PDFBOX-1996) PDSeparation separtion optimization

["Dave Smith (JIRA)" <ji...@apache.org>]

Dave Smith created PDFBOX-1996:
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             Summary: PDSeparation separtion 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


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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