This is the command ppmrelief that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
ppmrelief - run a Laplacian relief filter on a portable pixmap
SYNOPSIS
ppmrelief [ppmfile]
DESCRIPTION
Reads a portable pixmap as input. Does a Laplacian relief filter, and writes a portable
pixmap as output.
The Laplacian relief filter is described in "Beyond Photography" by Holzmann, equation
3.19. It's a sort of edge-detection.
Use ppmrelief online using onworks.net services