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<refentry id="png-4">

<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>

<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>