Set _ICC_PROFILE atom
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While xcalib sets the calibration curves for a monitor, there is another property that remains untouched. X's _ICC_PROFILE atom can be used by application to become aware fo the current display's color profile. There are numerous applications that make us of this property nowadays.
http://www.burtonini.com/computing/x-icc-profiles-spec-latest.html
xicc is a small tool which sets this profile:
http://www.burtonini.com/computing/xicc-0.2.tar.gz
It would be very beneficial if xcalib could set _ICC_PROFILE in addition to setting the calibration curves. argyll's dispwin also does both, but is part of a bigger software suite and not a cool little standalone tool like xcalib is :)