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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML><HEAD><TITLE>Pngtopnm User Manual</TITLE></HEAD>
<BODY>
<H1>pngtopnm</H1>
Updated: 22 July 2008
<BR>
<A HREF="#index">Table Of Contents</A>
<H2>NAME</H2>
pngtopnm - convert a PNG image into a PNM image
<H2 id="synopsis">SYNOPSIS</H2>
<B>pngtopnm</B>
[<b>-verbose</b>]
[<b>-alpha</b> | <b>-mix</b>]
[<b>-background</b>=<i>color</i>]
<BR>
[<b>-gamma</b>=<i>value</i>]
[<b>-text</b>=<i>filename</i>]
[<b>-time</b>]
[<I>pngfile</I>]
<P>Minimum unique abbreviation of option is acceptable. You may use double
hyphens instead of single hyphen to denote options. You may use white
space in place of the equals sign to separate an option name from its value.
<H2 id="description">DESCRIPTION</H2>
<p>This program is part of <a href="index.html">Netpbm</a>.
<p><b>pngtopnm</b> was obsoleted by <a
href="pngtopam.html"><b>pngtopam</b></a>, introduced with Netpbm 10.44
(September 2008). <b>pngtopam</b> is backward compatible with
<b>pngtopnm</b>, plus adds many additional functions, including the
ability to produce a PAM image that includes an alpha (transparency)
channel.
Starting in Release 10.48, <b>pngtopnm</b> is just an alias for
<b>pngtopam</b>.
<p><b>pngtopnm</b> remained in the Netpbm package through Release 10.47
because it may have fewer bugs than <b>pngtopam</b> in those releases, and may
be faster in some environments. But <b>pngtopnm</b>'s incompatibility with
the most current PNG libraries makes it impractical to maintain along with
<b>pngtopam</b> now.
<p>In releases before 10.48, you can use the <b>pngtopam</b> documentation for
<b>pngtopnm</b>, considering the following differences:
<ul>
<li><b>pngtopnm</b> options are a subset of <b>pngtopam</b>'s, as
documented above.
<li>Any change that the <b>pngtopam</b> manual says happened in or
after Netpbm 10.44 doesn't apply to <b>pngtopnm</b>.
</ul>
</BODY>
</HTML>
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