I saw a link pr gave out about a site full of decals... what i wanna know is.. is there any easier way to paste the decals than copying and pasting it then selecting all red parts?
So you put that entire image into a new layer? Then you set the layer style to multiply or overlay? Change the layer style to something else until it looks right.
It takes like one second to change the layer style in the layers window. Maybe you should learn about the tools of photoshop before you attempt to do something too complicated.