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pnmsmooth General Commands Manual pnmsmooth


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
3×3 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, pnm(5)

Copyright (C) 1989, 1991 by Jef Poskanzer.
Converted from script to C program December 1994 by Mike Burns

4 December 1994 pnmsmooth

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