tommyknocker

Hi everyone! I would like to know if there is a way to either isolate one color in ALL the photo/drawing/whatever. Like, isolating the white but leaving the shadows and the other colours untouched. Or else, I would like to know if there is a way to render one single colour transparent without affecting the others! Basically I want to make all the white in my drawing invisible so that I can use the shadowing of the drawing on a coloured background...is it possible?