Since I'm painting my characters and background elements on separate layers, I had an idea that it would be fun to process this painting as a 3D anaglyph image. This test image is very crude; the characters are all in their own flat two-dimensional plane so they look like cardboard cutouts. I think to make this possible and realistic I would have to use the Puppet Warp Tool in Photoshop. This way I could adjust the perspective angle of, say, the barbarian's sword and the archer's bow.
The basic technique is to have two sets of layers, one for each "eye." Each set will contain a Levels adjustment layer. The red set, viewable only to the left eye, will be positioned slightly to the right. The blue set, viewable only to the right eye, will be shifted to the left. The amount of distance between the two is proportional to how far the object is from the camera.
I already managed to make the ground plane appear as though it's receding into the distance. This was accomplished by applying a skew transformation to the ground layer. Again, it's very crude and will be more difficult to achieve as I add detail, but so far not a bad start with 30 minutes of layer adjustment.
Oh, and you'll need a set of red-blue 3D glasses to see it properly.
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