Pnmsmooth User Manual(0)                              Pnmsmooth User Manual(0)


       pnmsmooth - smooth out an image


       [-width=cols] [-height=rows]



       Deprecated backward-compatibility option:


       Minimum  unique abbreviation of option is acceptable.  You may use dou-
       ble hyphens instead of single hyphen to denote options.   You  may  use
       white space in place of the equals sign to separate an option name from
       its value.

       This program is part of Netpbm(1).

       pnmsmooth smoothes out an image by replacing each pixel with the  aver-
       age  of  its  width  X height neighbors.  It is implemented as a progam
       that generates a PGM convolution matrix and then invokes pnmconvol with


              These  options specify the dimensions of the convolution matrix.
              Default dimensions are 3 wide and 3 high.  Each  dimension  must
              be  odd.   The maximum size of the convolution matrix is limited
              by the maxval of the image such that width * height * 2 must not
              exceed the maxval.  (use pnmdepth to increase the maxval if nec-

              These options were new in Netpbm 10.32 (February 2006).   Before
              that, use -size.

       -size  This  deprecated  option  exists  in current Netpbm for backward
              compatibility.  It was obsoleted by -width and -height in Netpbm
              10.32 (February 2006).

              When  you  use  this option, the first two program arguments are
              the width and height, respectively, of  the  convolution  matrix
              and  do  the same thing as the -width and -height option values.
              The third (optional) program argument is the input file name.

              In reality, in old pnmsmooth, the width and height are two  val-
              ues  of  the  -size option, but the modern Netpbm command syntax
              paradigm doesn’t  allow  an  option  with  multiple  values,  so
              instead  -size  is  an option with no value and width and height
              are program arguments.  That has the fortunate effect of  making
              the  following  command mean the same in current pnmsmooth as in
              old pnmsmooth:
                   pnmsmooth -size 5 5 infile.ppm >outfile.ppm

              This options makes pnmsmooth only generate and save the convolu-
              tion file.  It does not invoke pnmconvol and does not produce an
              output image.

              pnmconvol(1), pnm(1)

       Before Netpbm 10.32 (February 2006), pnmsmooth did not use  the  modern
       Netpbm  command line parser, so had an unconventional command line syn-
       tax.  Most importantly, you could not  use  an  equal  size  or  double
       hyphens in the options.

netpbm documentation            4 December 1994       Pnmsmooth User Manual(0)

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