I have this thing I'm working on, it's the human body, with a circulatory system with veins that are 1 pixel wide. I put water in all of those veins, and I want to color it red so it will look like blood, but I don't want to manually do it, so how do I enter a console command or something else to color all of the water but not the other things around it.
You mean something like Deco Flood-Fill?