Man page 1 : pnmsmooth

pnmsmooth - smooth out an image

pnmsmooth [ -size width height ] [ -dump dumpfile ] [ pnmfile ]

Smooths out an image by replacing each pixel with the average of its width X height neighbors. It is implemented as a C progam that generates a PGM convolution matrix and then invokes pnmconvol .

-size width height

    Specifies the size of the convolution matrix. Default size is a 3x3 matrix. Width and height sizes must be odd. Maximum size of convolution matrix is limited by the maximum value for a pixel such that (width * height * 2) must not exceed the maximum pixel value.

-dump dumpfile

    Generates and saves the convolution file only. Use of this option does not invoke pnmconvol.

pnmconvol(1), pnm(5)

Copyright (C) 1989, 1991 by Jef Poskanzer.
Converted from script to C program December 1994 by Mike Burns ().