The ICC absolute colorimetric intent uses typical the bradford matrix: It works on the whole gamut involved in CIE*XYZ. See here: http://www.color.org/faqs.xalter#m10 That would not help in compensating colour swings along the gray axis.
The gray axis is independently corrected by each specific device profile, if not the calibration could do this by a set of 1D curves.
kind regards Kai-Uwe Behrmann --developing for colour management www.behrmann.name + www.oyranos.org
Am 18.01.11, 21:27 +0100 schrieb János, Tóth F.:
Does the Absolute colorimetric rendering intent (when used with XYZ-LUT target profiles) correct the white balance (across the whole luminance range and for every mixed colors*) or adjusts the white point only (and push every colors into that direction; or the grays only)? I can not describe it properly (language barrier), so here is an example: If a profiled RGB display behaves like this: 100, 100, 100 - reddish gray 150, 150, 150 - bluish gray 200, 200, 200 - greenish gray 256, 256, 256 - reddish gray Then will all of these colors be compensated to get closer to the "perfect gray" (with a color temperature of the source profile) and provide properly mixed colors (grays and "multidimensional"*) ; or will all of these colors be pushed into the cyan direction because the white point (at the peak RGB values) was reddish (and that applies for every mixed colors*)? And how does it applies for the mixed colors? Will a greenish magenta be corrected to "perfect magenta" (according to the source profile*) or will it be more bluish or simply pushed closer to cyan? *If they covered by the target gamut...
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