man > ppmrelief(1)

Ppmrelief User Manual(1)               General Commands Manual              Ppmrelief User Manual(1)

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:


           |  1  0  0 |
           |  0  0  0 |
           |  0  0 -1 |




OPTIONS
       There  are  no command line options defined specifically for ppmrelief, but it recognizes the
       options common to all programs based on libnetpbm (See ]8;;index.html#commonoptions\ Common Options]8;;\ .)


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


AUTHOR
       Copyright (C) 1990 by Wilson Bent (whb AT hoh-2.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(1)