Photoshop Query: Opacity and Colour Build Up
I'm currently designing my maps in Photoshop in a renaissance style. I'm going for a lot of plain colours with a low opacity which blend and flow to other colours, which is a great way to build up border zones.
However my problem lies with large areas. I find that I have to colour regions in in one go or risk taking my stylus off and having the colours build up if I colour over the same area twice. Is there a way to disable this build up?
Many thanks :)