ncluded,
   for both separable and non-separable kernels, using float arrays
   in the Pix.  Two implementations are included for grayscale and
   color bilateral filtering: a straightforward (slow) one, and a
   fast, approximate, separable one.

9. Image I/O

   Some facilities have been provided for image input and output.
   This is of course required to build executables that handle images,
   and many examples of such programs, most of which are for
   testing, can be built in the prog directory.  Fun