Sumi-e is a Japanese technique that involves using an ink-loaded wet brush to draw on highly absorbent rice paper, much like painting on a blotter. It works best with abstracts or landscapes, as it blurs portrait subjects a bit too much. The only controls are Stroke Width, Stroke Pressure, and Contrast.
Some filters do their work by finding the edges in your image, then enhancing them in some way. These filters all produce somewhat abstract effects, but if you check out the photography magazines you'll see that they are quite popular with traditional and digital photographers.
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