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 exam-tt "EXAMPLES">

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

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="tiffdither-1">

10139N/A<refmeta><refentrytitle>tiffdither</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>tiffdither</primary></indexterm><indexterm><primary>convert

10139N/Aa grayscale image to bilevel using dithering</primary></indexterm>

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

10139N/Aconvert a grayscale image to bilevel using dithering</refpurpose></refnamediv>

10139N/A<refsynopsisdiv id="tiffdither-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" rep="norepeat"><option

10139N/Arole="nodash"><replaceable>input.tif</replaceable></option></arg><arg choice="plain"

10139N/Arep="norepeat"><option role="nodash"><replaceable>output.tif</replaceable></option></arg>

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

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

10139N/A<para><command>&cmd;</command> converts a single-channel 8-bit grayscale image

10139N/Ato a bilevel image using Floyd-Steinberg error propagation with thresholding.

10139N/A</para>

10139N/A</refsect1>

10139N/A<refsect1 id="tiffdither-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 g3</option></term><listitem><para>CCITT Group

10139N/A3 compression algorithm.</para>

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

10139N/A<varlistentry><term><option>c g4</option></term><listitem><para>CCITT Group

10139N/A4 compression algorithm.</para>

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

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>By default, <command>&cmd;</command> compresses data

10139N/Aaccording to the value of the Compression tag found in the source file.</para>

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

10139N/A<varlistentry><term><option>f</option></term><listitem><para>Specify the bit

10139N/Afill order to use to write output data. By default, <command>&cmd;</command>

10139N/Acreates a new file with the same fill order as the original. Specify <option>

10139N/Af lsb2msb</option> to force data to be written with the FillOrder tag set

10139N/Ato LSB2MSB. Specify <option>f msb2lsb</option> to force data to be written

10139N/Awith the FillOrder tag set to MSB2LSB.</para>

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

10139N/A<varlistentry><term><option>t</option></term><listitem><para>Set the threshold

10139N/Avalue for dithering. By default, the threshold value is 128.</para>

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

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

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

10139N/A<para>The CCITT Group 3 and Group 4 compression algorithms can only be used

10139N/Awith bilevel data.</para>

10139N/A<para>Group 3 compression can be specified together with several T.4-specific

10139N/Aoptions:</para>

10139N/A<variablelist>

10139N/A<varlistentry><term><option role="nodash">1d</option></term><listitem><para>

10139N/A1-dimensional encoding</para>

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

10139N/A<varlistentry><term><option role="nodash">2d</option></term><listitem><para>

10139N/A2-dimensional encoding</para>

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

10139N/A<varlistentry><term><option role="nodash">fill</option></term><listitem><para>

10139N/AForce each encoded scanline to be zero-filled so that the terminating EOL

10139N/Acode lies on a byte boundary.</para>

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

10139N/A</variablelist><para>Group 3-specific options are specified by appending a

10139N/Acolon-separated list to the <option role="nodash">g3</option> option. For

10139N/Aexample, specify <option>c</option> <option role="nodash">g3:2d:fill</option>

10139N/Ato get 2D-encoded data with byte-aligned EOL codes.</para>

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="tiffdither-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="tiffdither-1-also"><title>&also-tt;</title>

11904N/A<para>

11904N/A<citerefentry><refentrytitle>pal2rgb</refentrytitle><manvolnum>1</manvolnum></citerefentry>,

11904N/A<citerefentry><refentrytitle>fax2tiff</refentrytitle><manvolnum>1</manvolnum></citerefentry>,

11904N/A<citerefentry><refentrytitle>tiffinfo</refentrytitle><manvolnum>1</manvolnum></citerefentry>,

11904N/A<citerefentry><refentrytitle>tiffcp</refentrytitle><manvolnum>1</manvolnum></citerefentry>,

11904N/A<citerefentry><refentrytitle>tiff2bw</refentrytitle><manvolnum>1</manvolnum></citerefentry>,

11904N/A<citerefentry><refentrytitle>libtiff</refentrytitle><manvolnum>3</manvolnum></citerefentry>

11904N/A</para>

10139N/A</refsect1>

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

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

10139N/A</refsect1>

10139N/A</refentry>