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Pamaddnoise User Manual(0)			    Pamaddnoise User Manual(0)

NAME
       pamaddnoise - add noise to a Netpbm image

SYNOPSIS
       pamaddnoise

       [-type noise_type]

       [-seed int] pamaddnoise -type gaussian

       [-sigma1 value]

       [-sigma2 value] [-seed int]

       [netpbmfile] pamaddnoise -type  multiplicative_gaussian

       [-mgsigma value] [-seed int]

       [netpbmfile] pamaddnoise -type impulse

       [-tolerance ratio]

       [-seed int] [netpbmfile] pamaddnoise -type  laplacian

       [-lsigma value]

       [-seed int] [netpbmfile] pamaddnoise -type  poisson

       [-lambda value]

       [-seed int] [netpbmfile]

DESCRIPTION
       This program is part of Netpbm(1).

       pamaddnoise   adds   the	 specified  noise  type	 to  a	Netpbm	image.
       pamaddnoise treats a PPM image as 3 independent planes, not as a	 plane
       of colors in a color space.

OPTIONS
       -lambda value
	      Used for poisson noise only.  The default value is 0.05.

       -lsigma value
	      Used for laplacian noise only.  The default value is 10.0.

       -mgsigma value
	      Used  for mutliplicative gaussian noise only.  The default value
	      is 0.5.

       -seed int
	      Used for all noise types.	 Set the initial random number genera‐
	      tor seed value.

       -sigma1 value
	      Used for gaussian noise only.  The default value is 4.0.

       -sigma2 value
	      Used for gaussian noise only.  The default value is 20.0.

       -tolerance ratio
	      Used  for	 impulse noise only.  The default value is 0.10.  This
	      means that 5% of all pixel values will be set to 0 and  5%  will
	      be set to the maxval

       -type noise_type
	      Select  type  of	noise  by name.	 The following noise types are
	      available: gaussian,  multiplicative_gaussian,  impulse,	lapla‐
	      cian,  poisson.	Only  enough letters to be unique are required
	      for the noise type option.  The default noise type is gaussian.

       ·      gaussian

       ·      mulitiplicative_gaussian

       ·      impulse

       ·      laplacian

       ·      poisson

REFERENCES
       ·      'Adaptive Image Restoration in  Signal-Dependent	Noise'	by  R.
	      Kasturi Institute for Electronic Science, Texas Tech University,
	      1982

       ·      'Digital Image Processing Algorithms' by Ioannis Pitas, Prentice
	      Hall, 1993 ISBN 0-13-145814-0

SEE ALSO
       pgmnoise(1), pgmmedian(1), pnm(1), pam(1),

HISTORY
       pamaddnoise was added to Netpbm in Version 10.29 (August 2005).	It had
       been distributed by Mike Burns via his own web site  before  that  (and
       continued to be so).

       Burns' version, and the one in Netpbm 10.29, was called pnmaddnoise and
       worked only on PNM images.  In Netpbm 10.30, it was converted to handle
       PAM images and renamed to pamaddnoise.

AUTHOR
       Copyright (C) 1995 by Mike Burns <burns@cac.psu.edu>

netpbm documentation	       14 November 1995	    Pamaddnoise User Manual(0)

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