Andreas F.X. Siegert wrote: > There is a reason why all raw converters use ProPhoto variants internally.... I actually don't really understand why ProPhoto has become so popular, as it is neither fish nor fowl. The attraction to RGB based colorspaces is that they are "easy to understand", and "easy to use" (although printing oriented people will argue that CMY is "more intuitive"). The primary values mean something - 1,0,0, is red, 0,1,0 is green, 1,1,1 is white, 0,0,1 is blue, etc. But like more abstract wide gamut spaces such as XYZ or L*a*b*, ProPhoto has two imaginary primaries, and blue and green are not humanly visible. So two out of the three primary values are not good mental anchors. So if you're going to pick a wide gamut space with that isn't "intuitive" or "easy to use", why not pick L*a*b* ? - at lest it is roughly perceptually uniform. Or if you want something RGB like with useful primaries but without a gamut limit, why not pick scRGB ? :-) Graeme Gill.