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     17 <refentry id="png-4">
     18 <!-- %Z%%M% %I% %E% SMI; -->
     19 <refmeta><refentrytitle>png.4</refentrytitle><manvolnum>4</manvolnum>
     20 <refmiscinfo class="date">26 Mar 2004</refmiscinfo>
     21 <refmiscinfo class="sectdesc">&man4;</refmiscinfo>
     22 <refmiscinfo class="software">&release;</refmiscinfo>
     23 <refmiscinfo class="arch">generic</refmiscinfo>
     24 <refmiscinfo class="copyright">&suncopy;</refmiscinfo>
     25 </refmeta>
     26 <indexterm><primary>png</primary></indexterm><indexterm><primary>Portable
     27 Network Graphics (PNG) format</primary></indexterm>
     28 <refnamediv id="png-4-name"><refname>png</refname><refpurpose>Portable Network
     29 Graphics (PNG) format</refpurpose></refnamediv>
     30 <refsect1 id="png-4-desc"><title>&desc-tt;</title>
     31 <para>PNG (Portable Network Graphics) is an extensible file format for the
     32 lossless, portable, well-compressed storage of raster images. PNG provides
     33 a patent-free replacement for GIF and can also replace many common uses of
     34 TIFF. Indexed-color, grayscale, and truecolor images are supported, and an
     35 optional alpha channel. Sample depths range from 1 to 16 bits.</para>
     36 <para>PNG is designed to work well in online viewing applications, such as
     37 the World Wide Web, and is fully streamable with a progressive display option.
     38 PNG is robust, and provides both full file integrity checking, and fast simple
     39 detection of common transmission errors. PNG can store gamma and chromaticity
     40 data for improved color matching on heterogeneous platforms.</para>
     41 </refsect1>
     42 <refsect1 id="png-4-attr"><title>&attr-tt;</title>
     43 <para>See <olink targetdocent="REFMAN5" localinfo="attributes-5"><citerefentry>
     44 <refentrytitle>attributes</refentrytitle><manvolnum>5</manvolnum></citerefentry></olink>
     45 for descriptions of the following attributes:</para>
     46 <informaltable frame="all">
     47 <tgroup cols="2" colsep="1" rowsep="1"><colspec colname="COLSPEC0" colwidth="1*">
     48 <colspec colname="COLSPEC1" colwidth="1*">
     49 <thead>
     50 <row><entry align="center" valign="middle">ATTRIBUTE TYPE</entry><entry align="center"
     51 valign="middle">ATTRIBUTE VALUE</entry></row>
     52 </thead>
     53 <tbody>
     54 <row><entry><para>Availability</para></entry><entry><para>SUNWpng</para></entry>
     55 </row>
     56 <row><entry colname="COLSPEC0"><para>Interface stability</para></entry><entry
     57 colname="COLSPEC1"><para>Volatile</para></entry></row>
     58 </tbody>
     59 </tgroup>
     60 </informaltable>
     61 </refsect1>
     62 <refsect1 id="png-4-also"><title>&also-tt;</title>
     63 <!--Reference to another man page-->
     64 <!--Reference to a Help manual-->
     65 <!--Reference to a book.-->
     66 <para><citerefentry><refentrytitle>libpng</refentrytitle><manvolnum>3</manvolnum>
     67 </citerefentry>, <citerefentry><refentrytitle>zlib</refentrytitle><manvolnum>
     68 3</manvolnum></citerefentry></para>
     69 <para>PNG 1.2 specification, July 1999: <literal>http://www.libpng.org/pub/png</literal>
     70 or <literal>ftp://ftp.uu.net/graphics/png/documents</literal>
     71 </para>
     72 <para>PNG 1.0 specification, October 1996: RFC 2083
     73 <literal>ftp://ds.internic.net/rfc/rfc2083.txt</literal>
     74 or as a W3C Recommendation at
     75 <literal>http://www.w3.org/TR/REC-png.html</literal></para>
     76 </refsect1>
     77 <refsect1 id="png-4-note"><title>&note-tt;</title>
     78 <para>This man page was originally written by Glenn Randers-Pehrson. Updated by Breda McColgan, Sun Microsystems Inc., 2004.</para>
     79 </refsect1>
     80 </refentry>
     81