# man > ppmrelief(1) > **TLDR:** Produce a relief of a PPM image. > - Produce a relief of the specified PPM image: `ppmrelief {{path/to/input_file.ppm}} > {{path/to/output_file.ppm}}` *Source: tldr-pages* --- [ppmrelief(1)](https://www.chedong.com/phpMan.php/man/ppmrelief/1/markdown) General Commands Manual [ppmrelief(1)](https://www.chedong.com/phpMan.php/man/ppmrelief/1/markdown) ## 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. ## SEE ALSO [pgmbentley(1)](https://www.chedong.com/phpMan.php/man/pgmbentley/1/markdown), [pgmoil(1)](https://www.chedong.com/phpMan.php/man/pgmoil/1/markdown), [ppm(5)](https://www.chedong.com/phpMan.php/man/ppm/5/markdown) ## AUTHOR Copyright (C) 1990 by Wilson Bent () 11 January 1991 [ppmrelief(1)](https://www.chedong.com/phpMan.php/man/ppmrelief/1/markdown)