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RedHat 9 (Linux i386) - man page for pnmsmooth (redhat section 1)

pnmsmooth(1)						      General Commands Manual						      pnmsmooth(1)

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 gener- ates 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 ( 4 December 1994 pnmsmooth(1)