6.10.2 Supplied Gamut Compression Procedures

The following equations are useful in describing gamut compression functions:

CIELab Psychometric Chroma = sqrt(a_star2 + b_star2)

CIELab Psychometric Hue = tan-1 b_star


CIELuv Psychometric Chroma = sqrt(u_star sup 2 + v_star sup 2 )

CIELuv Psychometric Hue = tan-1 v_star


The gamut compression callback procedures provided by Xlib are as follows:

Next: Prototype White Point Adjustment Procedure

Christophe Tronche, ch@tronche.com