freebsd man page for ppmrelief

ppmrelief(1)						      General Commands Manual						      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)