Gerard (and Graeme), > You can certainly build a RGB = XYZ identity profile, Could you briefly describe how to go about building such a profile? > but it is impossible to > have a single destination profile, such that the source RGB -> destination RGB > transformation does not alter the source RGB numbers, for any arbitrary source > profile being combined with this destination profile. You can only achieve a > RGB -> RGB identity transformation if both, source and destination profile > describe the same RGB color space. > > Regards, > Gerhard Roger Breton