ppmrelief  -  run  a Laplacian relief filter on a portable
       pixmap


SYNOPSIS

       ppmrelief [ppmfile]


DESCRIPTION

       Reads a portable pixmap as input.  Does a Laplacian relief
       filter, and writes a portable pixmap as output.

       The  Laplacian  relief filter is described in "Beyond Pho­
       tography" by Holzmann, equation  3.19.   It's  a  sort  of
       edge-detection.


SEE ALSO

       pgmbentley(1), pgmoil(1), ppm(5)


AUTHOR

       Copyright (C) 1990 by Wilson Bent (whb@hoh-2.att.com)


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