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 Photography" 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)

                                                 11 January 1991                                    ppmrelief(1)