Bug 79019 - pdftoppm and pdfimages produce a pale image for an ICC based CMYK colorspace image
Summary: pdftoppm and pdfimages produce a pale image for an ICC based CMYK colorspace ...
Status: RESOLVED FIXED
Alias: None
Product: poppler
Classification: Unclassified
Component: splash backend (show other bugs)
Version: unspecified
Hardware: Other All
: medium normal
Assignee: poppler-bugs
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Reported: 2014-05-21 14:13 UTC by Thomas Freitag
Modified: 2014-09-29 19:43 UTC (History)
0 users

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Attachments
testcase (1.09 MB, text/plain)
2014-05-21 14:13 UTC, Thomas Freitag 		Details
use alt colorspace to get CMYK values for an ICC based CMYK colorspace (1.60 KB, patch)
2014-05-21 14:19 UTC, Thomas Freitag 		Details | Splinter Review
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Description Thomas Freitag 2014-05-21 14:13:36 UTC 
Created attachment 99508 [details]
testcase

./utils/pdftoppm -png -cropbox -jpegcmyk testanzeige.pdf testanzeige 
or 
./utils/pdfimages -all testanzeige.pdf testanzeige
produces a very pale image for the attached PDF.
(poppler has to be compiled with SPLASH_CMYK defined for the pdftoppm testcase, pdfimages need only lcms enabled!)
Comment 1 Thomas Freitag 2014-05-21 14:19:27 UTC 
Created attachment 99510 [details] [review]
use alt colorspace to get CMYK values for an ICC based CMYK colorspace

The reason for the pale image is that GfxICCBasedColorSpace::getCMYK() uses the cms transformation to get RGB values and the convert it back to CMYK even for a ICC based CMYK colorspace instead of just returning the CMYK values itself. 

This patch solves that.
Comment 2 Albert Astals Cid 2014-09-29 19:43:08 UTC 
Pushed.

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