Ivan Kadomin wrote:
settings are available only. In "Custom Colors" in addition to RGB Gain and RGB Bias controls there are RGBCMY Hue/Saturation controls.
OK, on thinking about this a little more, I have a more refined suggestion: I gather each primary has a Saturation and Hue setting. What I'd try would be to: Set all the saturation controls to 100% or Maximum. Using dispwin & spotread, adjust the hue of R, G & B in turn to maximize chroma, ie. maximize a^2 + b^2, or even |a| + |b| may be sufficient guide. [ The aim is to put the fake RGB primaries right in the corners of the real native RGB triangle. ] Measure the Yxy for each of R, G & B. Compute the interpolated xy for the C, M & Y primaries from the R,G & B xy. (ie. Cx = (Gx + Bx)/2, etc.) Adjust the C, M & Y hues to have an xy closes to your computed xy. [ The aim is to make C, M & Y the natural linear combination of the real primaries. ] (This all assumes that the controls place the fake primaries on the edge of the native gamut boundaries, and don't put them outside that boundary and clip.) Unless they are actually implemented in hardware rather than simply changing lookup tables, the RGB Gain and RGB Bias controls should probably be set to "do nothing" settings, although it's probably worth a fiddle to see what they actually do. Graeme Gill.