OK, I must have not been overly clear - in the final packed, vac'd and stacked image, thrown into PS or whatever PICTURE editor you use, what BENCHMARK to use to judge colours?
I understand personal choice, but surely there is some benchmark to which to match colours?
H, go off tangent all you like - it's not a problem, I just saw us drifting away from what I was asking, and that is, colour "standards", if they even exist. I note a good degree of colour conformity across larger telescope establishments, and that is what I try to standardise mine on (some images OLD).