[gs-bugs] [Bug 691462] Image much darker after icc_work merge - part deux

[bugzilla-daemon at ghostscript.com]

http://bugs.ghostscript.com/show_bug.cgi?id=691462

--- Comment #4 from Michael Vrhel <michael.vrhel at artifex.com> 2010-07-30 17:49:29 UTC ---
OK.  So the transfer curves ARE getting applied.  This is what is creating the
negative of the image.  The issue is that we are doing a different color
conversion from the gray image to a cmyk output color space due to our default
ICC profiles. Prior to the ICC merge the code used the default BG/UCR curves
and a 1-X type model for this mapping.  Running with -dUseCIEColor in 8.71 you
will see something even darker than what is created with the ICC code.  What I
probably need to do is to create a set of ICC profiles that give similar
mappings to what the old PS rendering gave without -dUseCIEColor.   If someone
desired this type of mapping they could swap in those profiles.

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