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mathematical morphology with photoshop

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Does anyone know of a free or cheap photoshop filter that will do the basic [url="http://en.wikipedia.org/wiki/Mathematical_morphology"]morphological image processing[/url] operations. In particular I need the grayscale version of erosion. I can't imagine that such a photoshop filter doesn't exist, but I can't seem to find one.

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[quote name='jwezorek' timestamp='1298011175' post='4775737']
Does anyone know of any free or cheap photoshop filter that will do the basic [url="http://en.wikipedia.org/wiki/Mathematical_morphology"]morphological image processing[/url] operations. In particular I need the grayscale version of erosion. I can't imagine that such a photoshop filter doesn't exist, but I can seem to find one.
[/quote]

While you're waiting for a reply, you may want to look at the 'Maximum' and 'Minimum' filters (found under 'Other'). In a two-color black-and-white image, 'Maximum' = Erode, and 'Minimum' = Dilate. (Caveat: This works in the inf-norm (level sets are AABBs), not the 2-norm (the Euclidean norm; level sets are circles).)

(You can always improvise with the Expand/Contract selection modifiers as well, but I know that'd be extremely clunky.)

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