John Hewson created PDFBOX-1851:
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Summary: [PATCH] Improved CMYK color space conversion
Key: PDFBOX-1851
URL: https://issues.apache.org/jira/browse/PDFBOX-1851
Project: PDFBox
Issue Type: Improvement
Affects Versions: 2.0.0
Reporter: John Hewson
This is a patch to resolve a long-standing issue with CMYK color spaces.
DeviceCMYK is a device-dependent color space and so should always be associated
with an ICC color profile. In Acrobat the default profile is "U.S. Web Coated
(SWOP) v2", which unfortunately is only available from Adobe under a non-free
license.
I've modified PDDeviceCMYK to use an ICC color profile rather than a hardcoded
transform, this allows the user to use their own profile. I've included "ISO
Coated v2 300% (basICColor)" as the default profile, which is from OpenICC
http://www.freedesktop.org/wiki/OpenIcc/ProfilePackages/ redistributed under
the zlib license. This color space is an open alternative to a version produced
by ECI which is highly recommended as a generic CMYK profile.
Note: Using ICC profiles is a huge improvement on the matrix-based transform
used by Xpdf, Poppler, MuPDF, etc.
This patch requires the following file to be deleted:
pdfbox/src/main/java/org/apache/pdfbox/pdmodel/graphics/color/ColorSpaceCMYK.java
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