10139N/A<!DOCTYPE REFENTRY PUBLIC "-//Sun Microsystems//DTD DocBook V3.0-Based SolBook Subset V2.0//EN" [

10139N/A<!--ArborText, Inc., 1988-1999, v.4002-->

10139N/A<!ENTITY exde-tt "EXTENDED DESCRIPTION">

10139N/A<!ENTITY cmd "tiffmedian">

10139N/A<!ENTITY % commonents SYSTEM "smancommon.ent">

10139N/A%commonents;

10139N/A<!ENTITY % booktitles SYSTEM "booktitles.ent">

10139N/A%booktitles;

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

10139N/A]>

10139N/A<?Pub UDT _bookmark _target>

10139N/A<?Pub Inc>

10139N/A<refentry id="tiffmedian-1">

10139N/A<refmeta><refentrytitle>tiffmedian</refentrytitle><manvolnum>1</manvolnum>

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

10139N/A<refmiscinfo class="sectdesc">&man1;</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>tiffmedian</primary></indexterm><indexterm><primary>apply

10139N/Athe median cut algorithm to data in a TIFF file</primary></indexterm>

10139N/A<refnamediv id="tiffmedian-1-name"><refname>tiffmedian</refname><refpurpose>

10139N/Aapply the median cut algorithm to data in a TIFF file</refpurpose></refnamediv>

10139N/A<refsynopsisdiv id="tiffmedian-1-synp"><title>&synp-tt;</title>

10139N/A<cmdsynopsis><command>&cmd;</command><arg choice="opt"><option role="nodash"><replaceable>

10139N/Aoptions</replaceable></option></arg><arg choice="plain"><option role="nodash"><replaceable>

10139N/Ainput.tif</replaceable></option></arg><arg choice="plain"><option role="nodash"><replaceable>

10139N/Aoutput.tif</replaceable></option></arg>

10139N/A</cmdsynopsis></refsynopsisdiv>

10139N/A<refsect1 id="tiffmedian-1-desc"><title>&desc-tt;</title>

10139N/A<para><command>&cmd;</command> applies the median cut algorithm to an RGB

10139N/Aimage in <filename><replaceable>input.tif</replaceable></filename>, to generate

10139N/Aa palette image that is written to <filename><replaceable>output.tif</replaceable></filename>.

10139N/AThe generated colormap has, by default, 256 entries. The image data is quantized

10139N/Aby mapping each pixel to the closest color values in the colormap.</para>

10139N/A</refsect1>

10139N/A<refsect1 id="tiffmedian-1-opts"><title>&opts-tt;</title>

10139N/A<para>The following options are supported:</para>

10139N/A<variablelist termlength="narrow">

10139N/A<varlistentry><term><option>c</option></term><listitem><para>Specify a compression

10139N/Ascheme to use when writing image data:</para>

10139N/A<variablelist>

10139N/A<varlistentry><term><option>c lzw</option></term><listitem><para>Lempel-Ziv

10139N/Aand Welch algorithm.</para>

10139N/A</listitem></varlistentry>

10139N/A<varlistentry><term><option>c none</option></term><listitem><para>No compression.

10139N/A</para>

10139N/A</listitem></varlistentry>

10139N/A<varlistentry><term><option>c packbits</option></term><listitem><para>PackBits

10139N/Acompression algorithm.</para>

10139N/A</listitem></varlistentry>

10139N/A<varlistentry><term><option>c zip</option></term><listitem><para>Deflate compression

10139N/Aalgorithm.</para>

10139N/A</listitem></varlistentry>

10139N/A</variablelist><para>If no compression-related option is specified, the input-file

10139N/Acompression algorithm is used.</para>

10139N/A</listitem></varlistentry>

10139N/A<varlistentry><term><option>C</option></term><listitem><para>Specify the number

10139N/Aof entries to use in the generated colormap. By default, all 256 entries or

10139N/Acolors are used.</para>

10139N/A</listitem></varlistentry>

10139N/A<varlistentry><term><option>f</option></term><listitem><para>Apply Floyd-Steinberg

10139N/Adithering before selecting a colormap entry.</para>

10139N/A</listitem></varlistentry>

10139N/A<varlistentry><term><option>r</option></term><listitem><para>Write data with

10139N/Aa specified number of rows per strip. By default, the number of rows per strip

10139N/Ais selected so that each strip is approximately 8 kilobytes.</para>

10139N/A</listitem></varlistentry>

10139N/A</variablelist></refsect1>

10139N/A<refsect1 id="tiffmedian-1-oper"><title>&oper-tt;</title>

10139N/A<para>The following operands are supported:</para>

10139N/A<variablelist termlength="narrow">

10139N/A<varlistentry><term><option role="nodash"><replaceable>input.tif</replaceable></option></term>

10139N/A<listitem><para>The name of the input TIFF file.</para>

10139N/A</listitem></varlistentry>

10139N/A<varlistentry><term><option role="nodash"><replaceable>output.tif</replaceable></option></term>

10139N/A<listitem><para>The name of the output file.</para>

10139N/A</listitem></varlistentry>

10139N/A</variablelist></refsect1>

10139N/A<refsect1 id="tiffmedian-1-exde"><title>&exde-tt;</title>

10139N/A<para>LZW compression can be specified together with a predictor value. A

10139N/Apredictor value of 2 causes each scanline of the output image to undergo horizontal

10139N/Adifferencing before being encoded. A predictor value of 1 forces each scanline

10139N/Ato be encoded without differencing.</para>

10139N/A<para>LZW-specific options are specified by appending a colon-separated list

10139N/Ato the <option role="nodash">lzw</option> option. For example, specify <option>

10139N/Ac</option> <option role="nodash">lzw:2</option> for LZW compression with horizontal

10139N/Adifferencing.</para>

10139N/A</refsect1>

10139N/A<refsect1 id="tiffmedian-1-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/libtiff</para></entry>

10139N/A</row>

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

13623N/Acolname="COLSPEC1"><para>Uncommitted</para></entry></row>

10139N/A</tbody>

10139N/A</tgroup>

10139N/A</informaltable>

10139N/A</refsect1>

10139N/A<refsect1 id="tiffmedian-1-also"><title>&also-tt;</title>

11904N/A<para><citetitle>Color Image Quantization for Frame Buffer Display</citetitle>,

10139N/APaul Heckbert, SIGGRAPH proceedings, 1982, pp. 297-307.</para>

10139N/A<para><citerefentry><refentrytitle>pal2rgb</refentrytitle><manvolnum>1</manvolnum>

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

10139N/A1</manvolnum></citerefentry>, <citerefentry><refentrytitle>tiffcp</refentrytitle>

10139N/A<manvolnum>1</manvolnum></citerefentry>, <citerefentry><refentrytitle>tiffcmp

10139N/A</refentrytitle><manvolnum>1</manvolnum></citerefentry>, <citerefentry><refentrytitle>

10139N/Alibtiff</refentrytitle><manvolnum>3</manvolnum></citerefentry></para>

10139N/A</refsect1>

10139N/A<refsect1 id="tiffmedian-1-note"><title>&note-tt;</title>

10139N/A<para>Updated by Breda McColgan, Sun Microsystems Inc., 2004.</para>

10139N/A</refsect1>

10139N/A</refentry>