Quote Originally Posted by Athiril View Post
I would imagine you would shoot a grey scale along with various colour strips, and then you could measure the grey scale and compare to colour strips and see how much 'wrong colour' is in the colour strips (ie: green and blue in a mostly pure red target).
Well, assuming that nothing else is wrong with the method, you would still only see a certain relative strength of a certain color. For example, say that you used a strongly red-colored step wedge as a target. So perhaps you might say that an 80% saturated red color does not show a color cross. But isn't it possible that a 30% saturated red MIGHT have a crossover? Or a mix of 30% red and 50% blue, etc? The interactions between film layers are too complicated, I think, to generalize from a small handful of specific color tests.