pbmclean(1)                                                   General Commands Manual                                                  pbmclean(1)

NAME

       pbmclean - flip isolated pixels in portable bitmap

SYNOPSIS

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

       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.

       Before December 2001, pbmclean accepted -N instead of -minneighbors.

DESCRIPTION

       pbmclean cleans up a PBM image of random specs.  It reads a PBM image as input and outputs a PBM that is the same as the input except  with
       every pixel which has less than N identical neighbours inverted.

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

       (A  value  of  N 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 pix-
              els 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.

SEE ALSO

       pbm(5)

AUTHOR

       Copyright (C) 1990 by Angus Duggan Copyright (C) 1989 by Jef Poskanzer.  Copyright (C) 2001 by Michael Sternberg.

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

                                                                    18 Oct 2001                                                        pbmclean(1)