Ivan Tsyba wrote: > Seems that you right, it has more than 100% reflectance in some > wavelengths. Is it possible with UV-cut instrument (ColorMunki)? Yes. Fluorescent materials that emit at longer wavelengths like green and red are stimulated by visible light. Short wavelength fluorescent emitters used for whitening paper are stimulated mainly by UV. > Is any chance to get gamut of all possible colors of surfaces for my 3d > visualisation purposes? I'm not really sure on the way to create such a thing properly, but in the source code there is gamut/GenVisGam.c that when built and run creates a VisGamut.gam file. This would be something like all possible surface colors. Graeme Gill.