How about a color_matrix? It would simply transform the colors of the 
image according to a matrix, it should make a lot of effects possible. 
This one should be easy enough to implement, I will make it my next 
project.
After that, I will try the blur/convolution/displacement matrix(still 
not sure if "convolution matrix" is the right name for it).

-- 
Christopher James Huff - Personal e-mail: chr### [at] yahoocom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://chrishuff.dhs.org/
TAG Web page: http://tag.povray.org/

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