Ppmrelief User Manual(0)                              Ppmrelief User Manual(0)



NAME
       ppmrelief - compute a relief of a PPM image


SYNOPSIS
       ppmrelief

       [ppmfile]


DESCRIPTION
       This program is part of Netpbm(1).

       ppmrelief reads a PPM image as input, and writes a relief of that image
       as a PPM image as output.

       The relief process is described in "Beyond Photography" by Holzmann,
       equation 3.19.  It's a sort of edge-detection and is essentially a
       convolution with this matrix:

       <span style="font-family: monospace">
           |  1  0  0 |
           |  0  0  0 |
           |  0  0 -1 |
       </span>


OPTIONS
       There are no command line options defined specifically for ppmrelief,
       but it recognizes the options common to all programs based on libnetpbm
       (See
        Common Options <index.html#commonoptions> .)


SEE ALSO
       pamshadedrelief(1), pgmbentley(1), pgmoil(1), ppm(1)


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

DOCUMENT SOURCE
       This manual page was generated by the Netpbm tool 'makeman' from HTML
       source.  The master documentation is at

              http://netpbm.sourceforge.net/doc/ppmrelief.html

netpbm documentation            02 August 2014        Ppmrelief User Manual(0)