ppmrelief man page
ppmrelief — compute a relief of a PPM image
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 |
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).