Petr Slaby created PDFBOX-2727:
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Summary: Cache color space instances
Key: PDFBOX-2727
URL: https://issues.apache.org/jira/browse/PDFBOX-2727
Project: PDFBox
Issue Type: Improvement
Components: Rendering
Affects Versions: 2.0.0
Reporter: Petr Slaby
I have a PDF from a customer which contains a lot of calls of
SetNonStrokingColorSpace and SetStrokingColorSpace. Each time, an embedded
color profile resource is loaded via ICC_Profile.getInstance(InputStream). I
have attempted to cache the result in PDResources.java as shown in the attached
patch. For this particular PDF, this change improves the performance of
PDFToImage from 27 seconds down to 5 seconds (the PDF has two pages). I cannot
share the customer PDF, so I have attempted to find a similar free one.
Unfortunately, in my test suite, I did not find anything with a comparable
improvement. The best example I found is in the attached PDF. There the
improvement is from 4.9 seconds without caching to 4.1 with caching.
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