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pnmsmooth - smooth out an image
pnmsmooth [pnmfile]
Smooths out an image by replacing each pixel with the average of its nine immediate neighbors. It is implemented as a simple script using pnmconvol.
pnmconvol(1), pnm(5)
It's a script. Scripts are not portable to non-Unix environments.
Copyright (C) 1989, 1991 by Jef Poskanzer. 13 January 1991 pnmsmooth(1)