NAME

       ppmspread - displace a PPM image's pixels by a random amount

SYNOPSIS

       ppmspread amount [ppmfile] [-randomseed=integer]

DESCRIPTION

       This program is part of Netpbm(1).

       ppmspread reads a PPM image as input and moves every pixel around a random bit relative to
       its original position. amount determines by how many pixels a pixel is to be moved  around
       at most.

       Pictures  processed  with  this  filter  will  seem to be somewhat dissolved or unfocussed
       (although they appear more coarse than images processed by something like pnmconvol).

       The randomness in the image is limited before Netpbm 10.37 (December 2006) -- if  you  run
       the program twice in the same second, you may get identical output.

OPTIONS

       In addition to the options common to all programs based on libnetpbm (most notably -quiet,
       see
        Common Options ⟨index.html#commonoptions⟩ ), ppmspread recognizes the  following  command
       line options:

       -randomseed=integer
              This is the seed for the random number generator that generates the pixels.

              Use this to ensure you get the same image on separate invocations.

              This option was new in Netpbm 10.94 (March 2021).

SEE ALSO

       ppm(1), pnmconvol(1)

AUTHOR

       Copyright (C) 1993 by Frank Neumann

DOCUMENT SOURCE

       This  manual page was generated by the Netpbm tool 'makeman' from HTML source.  The master
       documentation is at

              http://netpbm.sourceforge.net/doc/ppmspread.html