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)