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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.3//EN">
<html><head><title>Pnmalias User Manual</title></head>
<body>
<h1>pnmalias</h1>
Updated: 15 March 2004
<br>
<a href="#index">Table Of Contents</a>
<h2>NAME</h2>
pnmalias - antialias a PNM image
<h2 id="synopsis">SYNOPSIS</h2>
<b>pnmalias</b>
[<b>-bgcolor</b> <i>color</i>]
[<b>-fgcolor</b> <i>color</i>]
[<b>-bonly</b>]
[<b>-fonly</b>]
[<b>-balias</b>]
[<b>-falias</b>]
[<b>-weight</b> <i>w</i>]
[<i>pnmfile</i>]
<h2 id="description">DESCRIPTION</h2>
<p>This program is part of <a href="index.html">Netpbm</a>.
<p><b>pnmalias</b> reads a PNM image as input, and applies
anti-aliasing to background and foreground pixels. If the input file
is a PBM, <b>pnmalias</b> promotes the output anti-aliased image to a
PGM, and prints a message informing the user of the change in format.
<h2 id="options">OPTIONS</h2>
<p>In addition to the options common to all programs based on libnetpbm
(most notably <b>-quiet</b>, see <a href="index.html#commonoptions">
Common Options</a>), <b>pnmalias</b> recognizes the following
command line options:
<p><b>-bgcolor</b> <i>colorb</i> sets the background color the
<i>colorb</i>.
<p><b>-fgcolor</b> <i>colorf</i> sets the foreground color to
<i>colorf</i>.
<p>Pixels with these values will be anti-aliased. By default,
<b>pnmalias</b> takes the background color to be black, and foreground
color to be white.
<p>Specify the color (<i>color</i>) as described for the <a
href="libnetpbm_image.html#colorname">argument of the <b>pnm_parsecolor()</b>
library routine</a>.
<p>Note that even when dealing with PGMs, background and foreground
colors need to be specified in the fashion described above. In this
case, <b>pnmalias</b> takes the background and foreground pixel values
to be the value of the red component for the specified color.
<p><b>-bonly</b> says to apply anti-aliasing only to the background pixels.
<p><b>-fonly</b> says to apply anti-aliasing only to the foreground pixels.
<p><b>-balias</b> says to apply anti-aliasing to all pixels surrounding
background pixels.
<p><b>-falias</b> says to apply anti-aliasing to all pixels surrounding
foreground pixels.
<p>If you specify neither <b>-balias</b> nor <b>-falias</b>,
<b>pnmalias</b> applies anti-aliasing only among neighboring
background and foreground pixels.
<p><b>-weight</b> <i>w</i> says to use <i>w</i> as the central weight
for the aliasing filter. <i>w</i> must be a real number in the range
0 < <i>w</i> < 1. The lower the value of <i>w</i> is, the
"blurrier" the output image is. The default is w = 1/3.
<h2 id="seealso">SEE ALSO</h2>
<a href="pbmtext.html">pbmtext</a>,
<a href="pnmsmooth.html">pnmsmooth</a>,
<a href="pnm.html">pnm</a>
<h2 id="author">AUTHOR</h2>
Copyright (C) 1992 by Alberto Accomazzi, Smithsonian Astrophysical Observatory.
<hr>
<h2 id="index">Table Of Contents</h2>
<ul>
<li><a href="#synopsis">SYNOPSIS</a>
<li><a href="#description">DESCRIPTION</a>
<li><a href="#options">OPTIONS</a>
<li><a href="#seealso">SEE ALSO</a>
<li><a href="#author">AUTHOR</a>
</ul>
</body>
</html>
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