flip isolated pixels in portable bitmap
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.
2001, pbmclean accepted -N instead of
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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
(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).
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
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.
1990 by Angus Duggan Copyright (C) 1989 by Jef Poskanzer.
Copyright (C) 2001 by Michael Sternberg.
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 copyright notice and this
permission notice appear in supporting documentation. This
software is provided "as is" without express or