The median filter tends to preserve edges, which is good but it also tends to round corners, which is sometimes not so good. Unless you want that effect. Then it's actually pretty interesting.
As an experiment I tried it at various settings on a stochastic FM screened halftone. I like some of the results.
Median Filter radius = 3
This one is pretty crazy. Like a circuit board. It would be time consuming to make any other way.
Median Filter radius = 2
Median Filter radius = 1
UPDATE 7/14/2009
The median filter's behavior in the first image is so transformative, and so neighbor-dependent, that it reminds me of John Conway's Game of Life algorithm. It makes me want to implement the Game of Life in Photoshop.
...and as I look, not only do I find it's been done, but quite recently.
Even has a closeup of an eye represented by a stochastic halftone. That's kind of eerie.
We have the same eyeglasses. lol
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