source: general/graphlib/libjpeg.xml@ 70823f8

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
   "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;

<!ENTITY libjpeg-download-http "http://www.ijg.org/files/jpegsrc.v&libjpeg-version;.tar.gz">
<!ENTITY libjpeg-download-ftp "ftp://ftp.uu.net/graphics/jpeg/jpegsrc.v&libjpeg-version;.tar.gz">
<!ENTITY libjpeg-size "599 KB">
<!ENTITY libjpeg-buildsize "3.7 MB">
<!ENTITY libjpeg-time "0.26 SBU">

]>

<sect1 id="libjpeg" xreflabel="libjpeg-&libjpeg-version;">
<?dbhtml filename="libjpeg.html"?>
<title>libjpeg-&libjpeg-version;</title>

<sect2>
<title>Introduction to <application>libjpeg</application></title>
                                                                               
<para>The <application>libjpeg</application> package contains libraries
that allow compression of image files based on the Joint Photographic Experts
Group standard. It is a "lossy" compression algorithm.</para>
                                                                               
<sect3><title>Package information</title>
<itemizedlist spacing='compact'>
<listitem><para>Download (HTTP): <ulink url="&libjpeg-download-http;"/></para></listitem>
<listitem><para>Download (FTP): <ulink url="&libjpeg-download-ftp;"/></para></listitem>
<listitem><para>Download size: &libjpeg-size;</para></listitem>
<listitem><para>Estimated Disk space required: &libjpeg-buildsize;</para></listitem>
<listitem><para>Estimated build time: &libjpeg-time;</para></listitem></itemizedlist>
</sect3>
                                                                               
</sect2>

<sect2>
<title>Installation of <application>libjpeg</application></title>
                                                                               
<para>Install <application>libjpeg</application> by running the following commands:</para>
                                                                               
<screen><userinput><command>./configure --enable-static --enable-shared --prefix=/usr &amp;&amp;
make &amp;&amp;
make install</command></userinput></screen>
                                                                               
</sect2>

<sect2>
<title>Command explanations</title>
                                                                               
<para><command>./configure --enable-static --enable-shared --prefix=/usr</command>: This command tells libjpeg to build both shared and static libraries and
to install them with a base of <filename>/usr</filename>.</para>
                                                                               
</sect2>

<sect2>
<title>Configuring <application>libjpeg</application></title>
                                                                               
<sect3><title>Configuration Information</title>
                                                                               
<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="../../lib-config.xml"/> 
                                                                               
</sect3>
                                                                               
</sect2>

<sect2>
<title>Contents</title>
                                                                               
<para>The libjpeg package contains <command>cjpeg</command>,
<command>djpeg</command>, <command>jpegtran</command>,
<command>rdjpgcom</command>, <command>wrjpgcom</command> and
<filename>libjpeg</filename> libraries.</para>
                                                                               
</sect2>
                                                                               
<sect2><title>Description</title>
                                                                               
<sect3><title>cjpeg</title>
<para><command>cjpeg</command> compresses image files to produce a
<acronym>JPEG</acronym>/<acronym>JFIF</acronym> file on the standard
output.  Currently supported input file formats are:
<acronym>PPM</acronym> (PBMPLUS color
format), <acronym>PGM</acronym> (PBMPLUS gray-scale
format), <acronym>BMP</acronym>, and Targa.</para></sect3>
                                                                               
<sect3><title>djpeg</title>
<para><command>djpeg</command> decompresses image files from
<acronym>JPEG/JFIF</acronym> format to either <acronym>PPM</acronym>
(PBMPLUS color format), <acronym>PGM</acronym> (PBMPLUS gray-scale
format), <acronym>BMP</acronym>, or Targa
format.</para></sect3>
                                                                               
<sect3><title>jpegtran</title>
<para><command>jpegtran</command> is used for lossless transformation of
<acronym>JPEG</acronym> files.</para></sect3>
                                                                               
<sect3><title>rdjpgcom</title>
<para><command>rdjpgcom</command> displays text comments from within a
<acronym>JPEG</acronym> file.</para></sect3>
                                                                               
<sect3><title>wrjpgcom</title>
<para><command>wrjpgcom</command> inserts text comments into a
<acronym>JPEG</acronym> file.</para></sect3>
                                                                               
<sect3><title>jpeg libraries</title>
<para>These libraries are used by many programs for reading and writing
jpeg format files.</para></sect3>
                                                                               
</sect2>

</sect1>