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 |
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 .)
pamshadedrelief(1), pgmbentley(1), pgmoil(1), ppm(1)
Copyright (C) 1990 by Wilson Bent (firstname.lastname@example.org)
This manual page was generated by the Netpbm tool 'makeman' from HTML source. The master documentation is at
pamcrater(1), pamoil(1), pamshadedrelief(1), pgmbentley(1), vidwhacker(6).