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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 neigh-
bors. It is implemented as a C progam that generates a PGM convolution matrix and then
-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 maxi-
mum pixel value.
Generates and saves the convolution file only. Use of this option does not invoke
Copyright (C) 1989, 1991 by Jef Poskanzer.
Converted from script to C program December 1994 by Mike Burns (email@example.com).
4 December 1994 pnmsmooth(1)
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