1Ppmspread User Manual(0)                              Ppmspread User Manual(0)
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NAME

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

10       ppmspread amount [ppmfile] [-randomseed=integer]
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DESCRIPTION

15       This program is part of Netpbm(1).
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17       ppmspread  reads  a  PPM  image as input and moves every pixel around a
18       random bit relative to its original position. amount determines by  how
19       many pixels a pixel is to be moved around at most.
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21       Pictures  processed with this filter will seem to be somewhat dissolved
22       or unfocussed (although they appear more coarse than  images  processed
23       by something like pnmconvol).
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25       The  randomness  in  the image is limited before Netpbm 10.37 (December
26       2006) -- if you run the program twice in the same second, you  may  get
27       identical output.
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OPTIONS

32       In  addition  to  the options common to all programs based on libnetpbm
33       (most notably -quiet, see
34        Common Options ⟨index.html#commonoptions⟩ ), ppmspread recognizes  the
35       following command line options:
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40       -randomseed=integer
41              This  is the seed for the random number generator that generates
42              the pixels.
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44              Use this to ensure you get the same image  on  separate  invoca‐
45              tions.
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47              This option was new in Netpbm 10.94 (March 2021).
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SEE ALSO

54       ppm(1), pnmconvol(1)
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AUTHOR

58       Copyright (C) 1993 by Frank Neumann
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DOCUMENT SOURCE

61       This  manual  page was generated by the Netpbm tool 'makeman' from HTML
62       source.  The master documentation is at
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64              http://netpbm.sourceforge.net/doc/ppmspread.html
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66netpbm documentation             06 March 2021        Ppmspread User Manual(0)