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
        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