ppmrelief

Create embossed relief effect

$ ppmrelief [input.ppm] > [output.ppm]

ppmrelief [file]

ppmrelief applies a convolution filter to a PPM image that creates an embossed relief effect, giving the image a three-dimensional chiseled appearance. Edges in the original image appear as raised ridges lit from one direction, while flat areas become a neutral gray.
The effect works by computing the difference between adjacent pixels, which highlights edges while suppressing uniform regions. Part of the Netpbm toolkit.

FILE

Input PPM file.

Simple convolution filter. Part of Netpbm suite.

ppmrelief was created as part of Netpbm for relief effect generation.

ppm(5), pnmconvol(1), pgmedge(1)