Ben Goren wrote: > ...or, perhaps, the yellow pigment is fluorescent? If so, I doubt you'll be > able to build a > profile at all and I [i]know[/i] you wouldn't be able to do so without some > insanely expensive > equipment. You can fudge it if the instrument illuminant is similar enough to the viewing illuminant. To measure once and predict the response in any illuminant does require bispectral measurement... Graeme Gill.