On Friday, December 07, 2012 10:16:36 AM Graeme Gill wrote: > XYZ values. That's difficult to determine mathematically, > so the practical means of determining this is to see if > the colors x,y values lie within the spectrum locus on > a chromaticity diagram. > ... Oh, that works? Well, I should be able to manage finding a point within a convex polygon. Thanks! -- Tom Schumm http://www.fortmyersgo.org/