SYNOPSIS
ppmrelief

[ppmfile]


DESCRIPTION
This program is part of Netpbm.

ppmrelief reads a PPM image as input, does a Laplacian relief filter,
and writes a PPM image 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, pgmoil, ppm


AUTHOR
Copyright (C) 1990 by Wilson Bent (whb@hoh-2.att.com)



netpbm documentation 11 January 1991 Ppmrelief User Manual(0)