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cyan = (cyan - black) / (1 - black)
magenta = (magenta - black) / (1 - black)
yellow = (yellow - black) / (1 - black) $c = 255 - $r;
$m = 255 - $g;
$y = 255 - $b;
$minCMY = min($c, $m, $y);
$c = $c - $minCMY \* 0.55;
$m = $m - $minCMY \* 0.55;
$y = $y - $minCMY \* 0.65;
$minCMY = ($minCMY \* 2) - 255;
$k = min(255, max(0, $minCMY)); http://research.microsoft… http://www.efg2.com/Lab/L… Color gamut mapping and the printing of digital color images (http://doi.acm.org/10.114…)
Accurate Color Reproduction for Computer Graphics Applications (http://doi.acm.org/10.114…) http://groups.google.com/… http://groups.google.com/…