[ SEA-GHOST MINI SHELL]
<!-- Creator : groff version 1.18.1 -->
<!-- CreationDate: Sat Feb 24 18:37:20 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 − 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>−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 &
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
‘‘:’’-separated list to the
‘‘g3’’ option; e.g. <b>−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
‘‘:’’-separated list to the
‘‘lzw’’ option; e.g. <b>−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>−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>−f lsb2msb</b> will force data to be written with
the <i>FillOrder</i> tag set to <small>LSB2MSB ,</small>
while <b>−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>−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>
SEA-GHOST - SHELL CODING BY SEA-GHOST