> all colors can be specified with light wavelength measures isn't that true? can't it be that instead of RGB color you say > light color wavelength instead? Not at all. There are lots of coloursthat are not equivalent to that of visible light of some single wavelength. Just think of purple. The term "colour" as used here means "colour as perceived by a human with normal colour vision" . Without referring to some animal's perception (or technical sensor's), the term "colour" is meaningless, and what actually exists in the physical sense is a spectrum of (visible) light wavelengths. Only so-called spectral colours (which are a very limited subset of the colours we can perceive) correspond to a specific wavelength of visible light. Read up on colour perception. For instance, start with http://en.wikipedia.org/wiki/Color , http://en.wikipedia.org/wiki/Spectral_color , http://en.wikipedia.org/wiki/Color_vision , http://en.wikipedia.org/wiki/CIE_1931_color_space and http://en.wikipedia.org/wiki/Purple . Ideally and simplified, for single largish fields of uniform colour, "idealistic" colour models as RGB or CMYK are as far as I know equivalent. But that is not what usually is meant when talking about "CMYK support" in software like GIMP. CMYK is used to describe colours in images as printed by actual physical processes on paper. In that context there are lots of very arcane and small-scale additional details that affects how the image end up looking. Think of issues as how well different inks can cover each other, how inks spreads onto the paper, what the colour of the actual paper itself is, how much ink can be printed before the paper cannot absorb any more and the ink starts to smear or whatever, etc. I am really no expert in this, but I do know enough that I understand this is not anything trivial;) --tml _______________________________________________ Gimp-developer mailing list Gimp-developer@xxxxxxxxxxxxxxxxxxxxxx https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
