Quote Originally Posted by AcuteEnigma View Post
Hard edge. That would be awesome! How did you do that?
I did it in Photoshop, but I'm sure you can do the same in GIMP or most other such programs.

1. I duplicated the color layer, put it below the first one and then desaturated it to greyscale.
2. I made the shape of the polygon, selected the outside, then deleted the colored layer outside the polygon.