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PROGRAM:

NAME


pnmalias - antialias a portable anyumap.

SYNOPSIS


pnmalias [-bgcolor color] [-fgcolor color] [-bonly] [-fonly] [-balias] [-falias] [-weight
w] [pnmfile]

DESCRIPTION


Reads a 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.

OPTIONS


-bgcolor 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 five ways:

o A name, assuming that a pointer to an X11-style color names file was compiled
in.

o An X11-style hexadecimal specifier: rgb:r/g/b, where r g and b are each 1- to
4-digit hexadecimal numbers.

o An X11-style decimal specifier: rgbi:r/g/b, where r g and b are floating point
numbers between 0 and 1.

o For backwards compatibility, an old-X11-style hexadecimal number: #rgb,
#rrggbb, #rrrgggbbb, or #rrrrggggbbbb.

o 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.

-bonly, -fonly
Apply anti-aliasing only to background (-bonly), or foreground (-fonly) pixels.

-balias, -falias
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.

-weight w
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.

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