[JAVA2D] Unsharp mask done well?

[James Carroll]

Hello, Unsharp mask done properly is a fairly expensive operation
(create blur mask, subtract mask from whole image, multiply whole
image...)  Does anyone know of an efficient implementation?  I'd like to
do it in an applet, and in under a tenth of a second for an 800x600
image on a 2GHz machine.  Java2D is okay in the applet.

Thanks!
-Jim

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