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  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)