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Pbmclean User Manual(0)                                Pbmclean User Manual(0)



NAME
       pbmclean - flip isolated pixels in portable bitmap


SYNOPSIS
       pbmclean [-minneighbors=N] [-black|-white] [pbmfile]


OPTION USAGE
       You  can  use the minimum unique abbreviation of the options.  You can use two hyphens instead of one.  You can
       separate an option name from its value with white space instead of an equals sign.


DESCRIPTION
       This program is part of Netpbm(1).

       pbmclean cleans up a PBM image of random specks.  It reads a PBM image as input and outputs a PBM that  is  the
       same as the input except with isolated pixels inverted.  An isolated pixel is one that has very few neighboring
       pixels of the same color.  The -minneighbors option gives the number of same-color neighbors are required.

       The default is 1 pixel -- only completely isolated pixels are flipped.

       (A -minneighbors value greater than 8 generates a completely inverted image (but use pnminvert to do  that)  --
       or a completely white or completely black image with the -black or -white option).

       pbmclean  considers the area beyond the edges of the image to be white.  (This matters when you consider pixels
       right on the edge of the image).

       You can use pbmclean  to clean up 'snow' on bitmap images.


OPTIONS
       -black

       -white Flip pixels of the specified color.  By default, if you specify  neither  -black  nor  -white,  pbmclean
              flips  both  black  and  white  pixels which do not have sufficient identical neighbors.  If you specify
              -black, pbmclean leaves the white pixels alone and just erases isolated black pixels.   Vice  versa  for
              -white.  You may specify both -black and -white to get the same as the default behavior.


       -minneighbors=N
              This  determines  how many pixels must be in a cluster in order for pbmclean to consider them legitimate
              and not clean them out of the image.  See Description .

              Before December 2001, pbmclean accepted -N instead of -minneighbors.  Before Netpbm 10.27 (March  2005),
              -minneighbors was -minneighbor.





SEE ALSO
       pbm(1)


AUTHOR
       Copyright  (C)  1990 by Angus Duggan Copyright (C) 1989 by Jef Poskanzer.  Copyright (C) 2001 by Michael Stern-
       berg.

       Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without
       fee  is  hereby granted, provided that the above copyright notice appear in all copies and that both that copy-
       right notice and this permission notice appear in supporting documentation.  This software is provided 'as  is'
       without express or implied warranty.



netpbm documentation              27 Feb 2005          Pbmclean User Manual(0)