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10139N/A<!ENTITY suncopy "Copyright (c) 2004, Sun Microsystems, Inc. All Rights Reserved.">

10139N/A]>

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10139N/A<?Pub EntList brvbar bull cross dash diam diams frac12 frac13 frac14 hellip

10139N/A laquo lArr loz mdash nabla ndash para pound rArr raquo sect yen bsol>

10139N/A<?Pub Inc>

10139N/A<refentry id="png-4">

10139N/A<refmeta><refentrytitle>png.4</refentrytitle><manvolnum>4</manvolnum>

10139N/A<refmiscinfo class="date">26 Mar 2004</refmiscinfo>

10139N/A<refmiscinfo class="sectdesc">&man4;</refmiscinfo>

10139N/A<refmiscinfo class="software">&release;</refmiscinfo>

10139N/A<refmiscinfo class="arch">generic</refmiscinfo>

10139N/A<refmiscinfo class="copyright">&suncopy;</refmiscinfo>

10139N/A</refmeta>

10139N/A<indexterm><primary>png</primary></indexterm><indexterm><primary>Portable

10139N/ANetwork Graphics (PNG) format</primary></indexterm>

10139N/A<refnamediv id="png-4-name"><refname>png</refname><refpurpose>Portable Network

10139N/AGraphics (PNG) format</refpurpose></refnamediv>

10139N/A<refsect1 id="png-4-desc"><title>&desc-tt;</title>

10139N/A<para>PNG (Portable Network Graphics) is an extensible file format for the

10139N/Alossless, portable, well-compressed storage of raster images. PNG provides

10139N/Aa patent-free replacement for GIF and can also replace many common uses of

10139N/ATIFF. Indexed-color, grayscale, and truecolor images are supported, and an

10139N/Aoptional alpha channel. Sample depths range from 1 to 16 bits.</para>

10139N/A<para>PNG is designed to work well in online viewing applications, such as

10139N/Athe World Wide Web, and is fully streamable with a progressive display option.

10139N/APNG is robust, and provides both full file integrity checking, and fast simple

10139N/Adetection of common transmission errors. PNG can store gamma and chromaticity

10139N/Adata for improved color matching on heterogeneous platforms.</para>

10139N/A</refsect1>

10139N/A<refsect1 id="png-4-attr"><title>&attr-tt;</title>

10139N/A<para>See <olink targetdocent="REFMAN5" localinfo="attributes-5"><citerefentry>

10139N/A<refentrytitle>attributes</refentrytitle><manvolnum>5</manvolnum></citerefentry></olink>

10139N/Afor descriptions of the following attributes:</para>

10139N/A<informaltable frame="all">

10139N/A<tgroup cols="2" colsep="1" rowsep="1"><colspec colname="COLSPEC0" colwidth="1*">

10139N/A<colspec colname="COLSPEC1" colwidth="1*">

10139N/A<thead>

10139N/A<row><entry align="center" valign="middle">ATTRIBUTE TYPE</entry><entry align="center"

10139N/Avalign="middle">ATTRIBUTE VALUE</entry></row>

10139N/A</thead>

10139N/A<tbody>

18745N/A<row><entry><para>Availability</para></entry><entry><para>image/library/libpng</para></entry>

10139N/A</row>

10139N/A<row><entry colname="COLSPEC0"><para>Interface stability</para></entry><entry

10139N/Acolname="COLSPEC1"><para>Volatile</para></entry></row>

10139N/A</tbody>

10139N/A</tgroup>

10139N/A</informaltable>

10139N/A</refsect1>

10139N/A<refsect1 id="png-4-also"><title>&also-tt;</title>

10139N/A<para><citerefentry><refentrytitle>libpng</refentrytitle><manvolnum>3</manvolnum>

10139N/A</citerefentry>, <citerefentry><refentrytitle>zlib</refentrytitle><manvolnum>

10139N/A3</manvolnum></citerefentry></para>

11933N/A<para>PNG 1.2 specification, July 1999: <literal>http://www.libpng.org/pub/png</literal>

11933N/Aor <literal>ftp://ftp.uu.net/graphics/png/documents</literal>

10139N/A</para>

11933N/A<para>PNG 1.0 specification, October 1996: RFC 2083

11933N/A<literal>ftp://ds.internic.net/rfc/rfc2083.txt</literal>

11933N/Aor as a W3C Recommendation at

11933N/A<literal>http://www.w3.org/TR/REC-png.html</literal></para>

10139N/A</refsect1>

11904N/A<refsect1 id="png-4-note"><title>&note-tt;</title>

10139N/A<para>This man page was originally written by Glenn Randers-Pehrson. Updated by Breda McColgan, Sun Microsystems Inc., 2004.</para>

10139N/A</refsect1>

10139N/A</refentry>