[Poppler-bugs] [Bug 14526] Poppler incorrectly renders CMYK colors

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=14526





--- Comment #3 from Adrian Johnson <ajohnson at redneon.com>  2008-02-16 23:58:42 PST ---
I opened your sample PDF in Poppler, Ghostscript, and Adobe Reader and compared
the color.

The results are:

Viewer        RGB (on a 0-255 scale)
------------------------------------
Poppler          (0, 173, 239)
Adobe Reader     (0, 174, 239)
Ghostscript      (0, 255, 255)

The Poppler results closely match Adobe Reader.

Adobe Reader implements color management which gives much better
results than a simple (1-c) conversion. I don't know the specifics of
what Adobe Reader is doing and the Poppler code for doing the CMYK to
RGB conversion has no useful comments. However it is clear that
Poppler is doing the same thing as Adobe Reader (for this one color at
least).


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