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.
Generates and saves the convolution file only. Use of this
option does not invoke pnmconvol.
Copyright (C) 1989, 1991 by Jef Poskanzer.
Converted from script to C program December 1994 by Mike