Can you supply details of which CAT we should use? Bradford? Von Kries? Another?
Any reference to the actual formula would be appreciated? Gerhard Fuernkranz wrote:
John Weissberg wrote: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?This is a chromatic adaptation transformation.Is it simply adding/subtracting the DeltaE between the whitepoint and 100,0,0 ?No. Convert to XYZ, apply the CAT, and convert back to L*a*b*. Regards, GerhardIs delta value added for all points in the color space? Only for points where L is above a certain limit? Any information is appreciated.