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-<!-- Creator : groff version 1.18.1 -->
-<!-- CreationDate: Fri Jul 13 17:43:19 2007 -->
-<html>
-<head>
-<meta name="generator" content="groff -Thtml, see www.gnu.org">
-<meta name="Content-Style" content="text/css">
-<title>TIFFDITHER</title>
-</head>
-<body>
-
-<h1 align=center>TIFFDITHER</h1>
-<a href="#NAME">NAME</a><br>
-<a href="#SYNOPSIS">SYNOPSIS</a><br>
-<a href="#DESCRIPTION">DESCRIPTION</a><br>
-<a href="#OPTIONS">OPTIONS</a><br>
-<a href="#NOTES">NOTES</a><br>
-<a href="#SEE ALSO">SEE ALSO</a><br>
-
-<hr>
-<a name="NAME"></a>
-<h2>NAME</h2>
-<!-- INDENTATION -->
-<table width="100%" border=0 rules="none" frame="void"
- cols="2" cellspacing="0" cellpadding="0">
-<tr valign="top" align="left">
-<td width="8%"></td>
-<td width="91%">
-<p>tiffdither &minus; convert a greyscale image to bilevel
-using dithering</p>
-</td>
-</table>
-<a name="SYNOPSIS"></a>
-<h2>SYNOPSIS</h2>
-<!-- INDENTATION -->
-<table width="100%" border=0 rules="none" frame="void"
- cols="2" cellspacing="0" cellpadding="0">
-<tr valign="top" align="left">
-<td width="8%"></td>
-<td width="91%">
-<p><b>tiffdither</b> [ <i>options</i> ] <i>input.tif
-output.tif</i></p>
-</td>
-</table>
-<a name="DESCRIPTION"></a>
-<h2>DESCRIPTION</h2>
-<!-- INDENTATION -->
-<table width="100%" border=0 rules="none" frame="void"
- cols="2" cellspacing="0" cellpadding="0">
-<tr valign="top" align="left">
-<td width="8%"></td>
-<td width="91%">
-<p><i>tiffdither</i> converts a single channel 8-bit
-greyscale image to a bilevel image using Floyd-Steinberg
-error propagation with thresholding.</p>
-</td>
-</table>
-<a name="OPTIONS"></a>
-<h2>OPTIONS</h2>
-<!-- TABS -->
-<table width="100%" border=0 rules="none" frame="void"
- cols="5" cellspacing="0" cellpadding="0">
-<tr valign="top" align="left">
-<td width="10%"></td>
-<td width="2%">
-
-<p><b>&minus;c</b></p>
-</td>
-<td width="6%"></td>
-<td width="80%">
-
-<p>Specify the compression to use for data written to the
-output file: <b>none</b> for no compression, <b>packbits</b>
-for PackBits compression, <b>lzw</b> for Lempel-Ziv &amp;
-Welch compression, <b>zip</b> for Deflate compression,
-<b>g3</b> for CCITT Group 3 (T.4) compression, and <b>g4</b>
-for CCITT Group 4 (T.6) compression. By default
-<i>tiffdither</i> will compress data according to the value
-of the <i>Compression</i> tag found in the source file.</p>
-</td>
-<td width="0%">
-</td>
-</table>
-<!-- INDENTATION -->
-<table width="100%" border=0 rules="none" frame="void"
- cols="2" cellspacing="0" cellpadding="0">
-<tr valign="top" align="left">
-<td width="17%"></td>
-<td width="82%">
-<p>The <small>CCITT</small> Group 3 and Group 4 compression
-algorithms can only be used with bilevel data.</p>
-<!-- INDENTATION -->
-<p>Group 3 compression can be specified together with
-several T.4-specific options: <b>1d</b> for 1-dimensional
-encoding, <b>2d</b> for 2-dimensional encoding, and
-<b>fill</b> to force each encoded scanline to be zero-filled
-so that the terminating EOL code lies on a byte boundary.
-Group 3-specific options are specified by appending a
-&lsquo;&lsquo;:&rsquo;&rsquo;-separated list to the
-&lsquo;&lsquo;g3&rsquo;&rsquo; option; e.g. <b>&minus;c
-g3:2d:fill</b> to get 2D-encoded data with byte-aligned EOL
-codes.</p>
-<!-- INDENTATION -->
-<p><small>LZW</small> compression can be specified together
-with a <i>predictor</i> value. A predictor value of 2 causes
-each scanline of the output image to undergo horizontal
-differencing before it is encoded; a value of 1 forces each
-scanline to be encoded without differencing. LZW-specific
-options are specified by appending a
-&lsquo;&lsquo;:&rsquo;&rsquo;-separated list to the
-&lsquo;&lsquo;lzw&rsquo;&rsquo; option; e.g. <b>&minus;c
-lzw:2</b> for <small>LZW</small> compression with horizontal
-differencing.</p>
-</td>
-</table>
-<!-- TABS -->
-<table width="100%" border=0 rules="none" frame="void"
- cols="5" cellspacing="0" cellpadding="0">
-<tr valign="top" align="left">
-<td width="10%"></td>
-<td width="3%">
-
-<p><b>&minus;f</b></p>
-</td>
-<td width="5%"></td>
-<td width="80%">
-
-<p>Specify the bit fill order to use in writing output
-data. By default, <i>tiffdither</i> will create a new file
-with the same fill order as the original. Specifying
-<b>&minus;f lsb2msb</b> will force data to be written with
-the <i>FillOrder</i> tag set to <small>LSB2MSB ,</small>
-while <b>&minus;f msb2lsb</b> will force data to be written
-with the <i>Fill- Order</i> tag set to <small>MSB2LSB
-.</small></p>
-</td>
-<td width="0%">
-</td>
-<tr valign="top" align="left">
-<td width="10%"></td>
-<td width="3%">
-
-<p><b>&minus;t</b></p>
-</td>
-<td width="5%"></td>
-<td width="80%">
-
-<p>Set the threshold value for dithering. By default the
-threshold value is 128.</p>
-</td>
-<td width="0%">
-</td>
-</table>
-<a name="NOTES"></a>
-<h2>NOTES</h2>
-<!-- INDENTATION -->
-<table width="100%" border=0 rules="none" frame="void"
- cols="2" cellspacing="0" cellpadding="0">
-<tr valign="top" align="left">
-<td width="8%"></td>
-<td width="91%">
-<p>The dither algorithm is taken from the
-<b>tiffmedian</b>(1) program (written by Paul Heckbert).</p>
-</td>
-</table>
-<a name="SEE ALSO"></a>
-<h2>SEE ALSO</h2>
-<!-- INDENTATION -->
-<table width="100%" border=0 rules="none" frame="void"
- cols="2" cellspacing="0" cellpadding="0">
-<tr valign="top" align="left">
-<td width="8%"></td>
-<td width="91%">
-<p><b>pal2rgb</b>(1), <b>fax2tiff</b>(1),
-<b>tiffinfo</b>(1), <b>tiffcp</b>(1), <b>tiff2bw</b>(1),
-<b>libtiff</b>(3TIFF)</p>
-<!-- INDENTATION -->
-<p>Libtiff library home page:
-<b>http://www.remotesensing.org/libtiff/</b></p>
-</td>
-</table>
-<hr>
-</body>
-</html>