> http://windowssdk.msdn.microsoft.com/en-us/library/ms536900(VS.80).aspx > > Any comments? Interesting article, Rolf. I see a lot of "J" in this article. As in "Jch". Is that a CIECAM Lightness correlate? I have only "scanned" the text but from the graphs which explain various chroma and lightness compression schemes, it has a lot in common with the ICC system, conceptually. MfG, Roger Breton | Laval, Canada | graxx@xxxxxxxxxxxx http://pages.infinit.net/graxx