Unsharp Mask Filter on images?

[Sannyasin Sivakatirswami]

I know I'm probably crazy to expect Rev do just do absolutely anything 
we want..

But, has anyone attempted creating filters for images using the 
imageData... is it even possible? Only on .png files with alpha 
channels?

In particular I would love to be able to run an unsharp mask pass over 
digital images that are down sized for web deployment -- amount 62, 
radius 1 pixel, threshold zero

Presently we do this in Adobe's Image Ready and it really makes a very 
big difference in the quality of a picture going up for on screen 
viewing.

Sannyasin Sivakatirswami
Himalayan Academy Publications
at Kauai's Hindu Monastery
katir at hindu.org

www.HimalayanAcademy.com,
www.HinduismToday.com
www.Gurudeva.org
www.Hindu.org