I have some arches and I have set up chases going across the arches (so a strip of red going from one side to the other). At the moment all other pixels are off so you can only see the red strip going across. I would like to turn all pixels that aren't part of the red strip to a cyan colour. So it looks like a strip of red moving across a cyan background. Every time I try and past the cyan over the red chase the red chase disappears or changes colour. I've tried using paste from foreground, foreground effects, background effects but nothing works. Has anyone got a tip on how to achieve this.