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       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.

       -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)