> I'd like the opportunity to place a plea for abandoning filters
> altogether and going for filter layers instead (basically allowing to
> put any filter on an adjustment layer and change it dynamically
> afterwards).
Besides what Boudewijn said, there is a performance issue. Some filters 
works "localy", I think of invert, convolution etc, which means updating the 
results is quiet easy. Others needs to use information from the whole image, 
I am thinking about frequency based filters (like wavelets for unnoising or 
halftoning), and those filters are also very slow and won't be very usuable 
as filter masks/adjustement layers.

-- 
Cyrille Berger
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