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https://issues.apache.org/jira/browse/PDFBOX-1996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13947162#comment-13947162
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Tilman Hausherr commented on PDFBOX-1996:
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What would happen if an image has e.g. 300dpi (about 3500 x 2500 pixels) and
many different colors? Wouldn't this make a huge memory footprint? Or is the
Separation color space not used for such images?
> 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.
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