ppmrelief(1)

NAME
       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