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)