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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 multiplicative gaussian noise only.  The default value is 0.5.

       -seed int
	      Used for all noise types.  Set the initial random number generator 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, laplacian, poisson.  Only enough  letters  to  be
	      unique are required for the noise type option.  The default noise type is gaussian.

       o      gaussian

       o      multiplicative_gaussian

       o      impulse

       o      laplacian

       o      poisson

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

       o      '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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