Consider the following case: Converting from Lab -> CMYK using the BtoA tables of an ICC profile with "Absolute Colorimetric" as a rendering intent.
As I understand it, the ICC profile does not contain an Absolute colorimetric BtoA table. Rather, it will use the relative colorimetric BtoA table, along with whitepoint data, for any look-ups it makes.
Can anyone explain what algorithm is used for these conversions between relative and absolute colorimetric?
Is it simply adding/subtracting the DeltaE between the whitepoint and 100,0,0 ? Is delta value added for all points in the color space? Only for points where L is above a certain limit?
Any information is appreciated. -- John Weissberg PerfectProof - Accuracy Made Easy www.perfectproof.com www.printers-website.com www.proofmaster.net pakready.perfectproof.com USA (888) 623 3662 Tel. (888) 623 3662 FAX Europe +32 15 272502 Tel. +32 15 273740 FAX
