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
              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.

       -dump dumpfile
              Generates  and  saves  the  convolution  file only.  Use of this
              option does not invoke pnmconvol.

       pnmconvol(1), pnm(5)

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

                                4 December 1994                   pnmsmooth(1)
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