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Grinding Images Filter

Hello

Using cocoa I have to make some images on the fly depeding of incoming text.
Two of them has some parts to be grindend, like grind in Photoshop ( filters menu ).
Does someone knows how to do the grinding effect or has some pointers to some documentation to create this kind of effects?
What kind of formula will there be used? Can anybody shed some light on this?
I did google and visit some openGL sites, but to no avail.

Any help will be welcom
Thank you




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