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<refentry id="png-4">
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<refmeta><refentrytitle>png.4</refentrytitle><manvolnum>4</manvolnum>
<refmiscinfo class="date">26 Mar 2004</refmiscinfo>
<refmiscinfo class="sectdesc">&man4;</refmiscinfo>
<refmiscinfo class="software">&release;</refmiscinfo>
<refmiscinfo class="arch">generic</refmiscinfo>
<refmiscinfo class="copyright">&suncopy;</refmiscinfo>
</refmeta>
<indexterm><primary>png</primary></indexterm><indexterm><primary>Portable
Network Graphics (PNG) format</primary></indexterm>
<refnamediv id="png-4-name"><refname>png</refname><refpurpose>Portable Network
Graphics (PNG) format</refpurpose></refnamediv>
<refsect1 id="png-4-desc"><title>&desc-tt;</title>
<para>PNG (Portable Network Graphics) is an extensible file format for the
lossless, portable, well-compressed storage of raster images. PNG provides
a patent-free replacement for GIF and can also replace many common uses of
TIFF. Indexed-color, grayscale, and truecolor images are supported, and an
optional alpha channel. Sample depths range from 1 to 16 bits.</para>
<para>PNG is designed to work well in online viewing applications, such as
the World Wide Web, and is fully streamable with a progressive display option.
PNG is robust, and provides both full file integrity checking, and fast simple
detection of common transmission errors. PNG can store gamma and chromaticity
data for improved color matching on heterogeneous platforms.</para>
</refsect1>
<refsect1 id="png-4-attr"><title>&attr-tt;</title>
<para>See <olink targetdocent="REFMAN5" localinfo="attributes-5"><citerefentry>
<refentrytitle>attributes</refentrytitle><manvolnum>5</manvolnum></citerefentry></olink>
for descriptions of the following attributes:</para>
<informaltable frame="all">
<tgroup cols="2" colsep="1" rowsep="1"><colspec colname="COLSPEC0" colwidth="1*">
<colspec colname="COLSPEC1" colwidth="1*">
<thead>
<row><entry align="center" valign="middle">ATTRIBUTE TYPE</entry><entry align="center"
valign="middle">ATTRIBUTE VALUE</entry></row>
</thead>
<tbody>
<row><entry><para>Availability</para></entry><entry><para>image/library/libpng</para></entry>
</row>
<row><entry colname="COLSPEC0"><para>Interface stability</para></entry><entry
colname="COLSPEC1"><para>Volatile</para></entry></row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 id="png-4-also"><title>&also-tt;</title>
<!--Reference to another man page-->
<!--Reference to a Help manual-->
<!--Reference to a book.-->
<para><citerefentry><refentrytitle>libpng</refentrytitle><manvolnum>3</manvolnum>
</citerefentry>, <citerefentry><refentrytitle>zlib</refentrytitle><manvolnum>
3</manvolnum></citerefentry></para>
<para>PNG 1.2 specification, July 1999: <literal>http://www.libpng.org/pub/png</literal>
or <literal>ftp://ftp.uu.net/graphics/png/documents</literal>
</para>
<para>PNG 1.0 specification, October 1996: RFC 2083
<literal>ftp://ds.internic.net/rfc/rfc2083.txt</literal>
or as a W3C Recommendation at
<literal>http://www.w3.org/TR/REC-png.html</literal></para>
</refsect1>
<refsect1 id="png-4-note"><title>&note-tt;</title>
<para>This man page was originally written by Glenn Randers-Pehrson. Updated by Breda McColgan, Sun Microsystems Inc., 2004.</para>
</refsect1>
</refentry>
