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RedHat 9 (Linux i386) - man page for ppmrelief (redhat section 1)

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)