Chris Huff wrote in message ...

>Stuff I don't know how to implement, and don't think I can figure out,
>but which I think is useful, information on these would be welcome:
>    emboss
>    dither/halftone
>    sharpen_edges, and other "sharpen" filters. Blurring is pretty easy
>to figure out, but doing the opposite has me lost.
>    color_function, which would allow isosurface functions to act as
>filters. The problem is mostly that I don't know how to add
>variables/functions to isosurface functions, let alone functions which
>are only useable in certain areas.
>
>Stuff I don't even know the use for, let alone how to implement. Could
>anyone tell me what these are for?
>posterize
>laplace
>solarize
>despeckle


You might want to take a look at the source code for the GIMP.  It has
filters for all of these, except (I think) solarize.

Mark

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