antialias a portable anyumap.
see also :
pbmtext - pnmsmooth
[-bgcolor color] [-fgcolor
color] [-bonly] [-fonly]
[-balias] [-falias] [-weight w]
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portable anymap as input, and applies anti-aliasing to
background and foreground pixels. If the input file is a
portable bitmap, the output anti-aliased image is promoted
to a graymap, and a message is printed informing the user of
the change in format.
colorb, -fgcolor colorf
set the background color to
colorb, and the foreground to color to colorf.
Pixels with these values will be anti-aliased. by default,
the background color is taken to be black, and foreground
color is assumed to be white. The colors can be specified in
A name, assuming that a pointer to an X11-style color
names file was compiled in.
An X11-style hexadecimal specifier: rgb:r/g/b, where r g
and b are each 1- to 4-digit hexadecimal numbers.
An X11-style decimal specifier: rgbi:r/g/b, where r g
and b are floating point numbers between 0 and 1.
For backwards compatibility, an old-X11-style
hexadecimal number: #rgb, #rrggbb, #rrrgggbbb, or
For backwards compatibility, a triplet of numbers
separated by commas: r,g,b, where r g and b are floating
point numbers between 0 and 1. (This style was added before
MIT came up with the similar rgbi style.)
Note that even
when dealing with graymaps, background and foreground colors
need to be specified in the fashion described above. In this
case, background and foreground pixel values are taken to be
the value of the red component for the given color.
Apply anti-aliasing only to
background (-bonly), or foreground
Apply anti-aliasing to all
pixels surrounding background (-balias), or
foreground (-falias) pixels. By default,
anti-aliasing takes place only among neighboring background
and foreground pixels.
Use w as the central
weight for the aliasing filter. W must be a real
number in the range 0 < w < 1. The lower the
value of w is, the "blurrier" the output
image is. The default is w = 1/3.
pnmsmooth , pnm
1992 by Alberto Accomazzi, Smithsonian Astrophysical