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Dave Smith commented on PDFBOX-1996: ------------------------------------ I would check with John who wrote it but since we are sampling and only taking one float and dividing by 255 to get a value of 0..1 I would think we can only have 255 different values. > 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 > 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. -- This message was sent by Atlassian JIRA (v6.2#6252)