# ppmrelief

Updated: 11 January 1991
Index

## 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, pgmoil, ppm

## AUTHOR

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

## Index

NAME
SYNOPSIS
DESCRIPTION
SEE ALSO
AUTHOR