ppmrelief


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)
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