\
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.TH "Ppmrelief User Manual" 0 "11 January 1991" "netpbm documentation"

.UN lbAB
.SH NAME

ppmrelief - run a Laplacian relief filter on a PPM image

.UN lbAC
.SH SYNOPSIS

\fBppmrelief\fP

[\fIppmfile\fP]

.UN lbAD
.SH DESCRIPTION
.PP
This program is part of
.BR Netpbm (1)
.
.PP
\fBppmrelief\fP reads a PPM image as input,
does a Laplacian relief filter, and writes a PPM image as output.
.PP
The Laplacian relief filter is described in 'Beyond
Photography' by Holzmann, equation 3.19.  It's a sort of
edge-detection.

.UN lbAE
.SH SEE ALSO
.BR pgmbentley (1)
, 
.BR pgmoil (1)
, 
.BR ppm (5)


.UN lbAF
.SH AUTHOR

Copyright (C) 1990 by Wilson Bent (\fIwhb@hoh-2.att.com\fP)