pnmalias
antialias a portable anyumap.
see also :
pbmtext - pnmsmooth
Synopsis
pnmalias
[-bgcolor color] [-fgcolor
color] [-bonly] [-fonly]
[-balias] [-falias] [-weight w]
[pnmfile]
add an example, a script, a trick and tips
examples
no example yet ...
... Feel free to add your own example above to help other Linux-lovers !
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.
see also
pbmtext ,
pnmsmooth , pnm
author
Copyright (C)
1992 by Alberto Accomazzi, Smithsonian Astrophysical
Observatory.