Hello all!
I am trying to solve a problem with RGB to CMYK conversions using ICC
profiles liblcms and Image Magick.
I know many problems can be injected by IM itself but I've tried so many
things I want to isolate the problem as best as possible. (BTW I'm
running IM under x86 Linux - Red Hat & Mandrake and have been compiling
V1.08 & 1.09 of lcms with 2.4.7-4 of IM)
The problem manifests itself in that I get RGB images tagged with a CMYK
profile. This of course does not work very well.
A sample command line I am using is as follows:
convert srcImage.jpg +profile icm -profile rgb.icc \
-profile cmyk.icc outputImage.tif
This purges any existing profile, then tags the image with the source
profile and then the output profile. Unfortunately, as mentioned
earlier, the conversion is not taking place.
I suspect one of my problems could be bad profiles and would like to
eliminate that as the cause of my problems. My theory of the moment is
that IM/liblcms is not recognising some aspect of the source or
destination profiles and is therefore not translating the iamge from one
colorspace to another.
For testing, I downloaded the Adobe Photoshop profile package from the
Adobe website. I have several *legal* copies of Adobe's Photoshop (been
using it since it was called Barnescan XP in 1989) so have a few
iterations of profiles from Adobe laying about. I have also had
Macintosh computers for a long time on my network and have profiles
dating back to their first versions though they didn't add much to their
systems regarding print, it was all soft-proofing stuff.
I have tried dozens of combinations of display, input, colorspace and
output profiles i.e. AdobeRGB1988.icc -> USWebUncoaded.icc without any
success. (shell scripting made this easier). I have also downloaded and
decompressed the profiles under Windows, Mac OS9 & Mac OSX as well as
decompressed them under Linux too. Apparently, the ICC spec is that all
data is stored big-endian so x-platform issues should be less of an
issue.
Has anyone been able to successfully use profiles sourced from Adobe to
work with liblcms & Image Magick under Linux?
Alternatively, I could be having a compilation problem, however when I
install pre-built binaries from Red Hat and Mandrake, I have not been
able to successfully process images either.
Any thoughts or suggestions would be most welcome. I have tried so many
things that the frustration level is building and I'm running out of
time to get this to work.
Scott
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