smooth out an image
see also :
[-size width height] [-dump
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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
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
1989, 1991 by Jef Poskanzer.
Converted from script to C program December 1994 by Mike