ppmspread - displace a PPM image's pixels by a random amount - man(1) - [phpMan]

Che Dong

Displace the pixels in a PPM image by a randomized amount.

Displace the pixels in a PPM image by a randomized amount that is at most `a`
ppmspread {{a}} {{path/to/input_file.ppm}} > {{path/to/output_file.ppm}}
Specify a seed to a the pseudo-random number generator
ppmspread {{a}} {{path/to/input_file.ppm}} {{-r|-randomseed}} {{seed}} > {{path/to/output_file.ppm}}

Ppmspread User Manual(1)               General Commands Manual              Ppmspread User Manual(1)

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 (al‐
       though 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 ), 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

netpbm documentation                        06 March 2021                   Ppmspread User Manual(1)

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