> CS3 has this advanced B&W filer method tthat allows application of any color filters to a B&W image. While I do not understand the math, or principles, I use it occasionally to creat a spot color (say orange) negative. I wonder if in principle it could be used to create orange/green purple negatives for example.
I have tried also the color filter, but it is not as strong as the color
selection. Try for example with dots of different color, i.e. RGB and YMC on
a white background.