2006-03-13 10:06:17 -05:00
|
|
|
<!-- Creator : groff version 1.18.1 -->
|
2007-02-24 10:03:47 -05:00
|
|
|
<!-- CreationDate: Sat Feb 24 18:00:01 2007 -->
|
2002-10-07 09:47:36 -04:00
|
|
|
<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>
|
2006-03-13 10:06:17 -05:00
|
|
|
<!-- 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>
|
2002-10-07 09:47:36 -04:00
|
|
|
<a name="SYNOPSIS"></a>
|
|
|
|
|
<h2>SYNOPSIS</h2>
|
2006-03-13 10:06:17 -05:00
|
|
|
<!-- 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>
|
2002-10-07 09:47:36 -04:00
|
|
|
<a name="DESCRIPTION"></a>
|
|
|
|
|
<h2>DESCRIPTION</h2>
|
2006-03-13 10:06:17 -05:00
|
|
|
<!-- 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>
|
2002-10-07 09:47:36 -04:00
|
|
|
<a name="OPTIONS"></a>
|
|
|
|
|
<h2>OPTIONS</h2>
|
2006-03-13 10:06:17 -05:00
|
|
|
<!-- TABS -->
|
2003-11-27 10:07:01 -05:00
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
2006-03-13 10:06:17 -05:00
|
|
|
cols="5" cellspacing="0" cellpadding="0">
|
2003-11-27 10:07:01 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-03-13 10:06:17 -05:00
|
|
|
<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>
|
2005-03-06 06:11:43 -05:00
|
|
|
</table>
|
2006-03-13 10:06:17 -05:00
|
|
|
<!-- 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
|
2005-03-06 06:11:43 -05:00
|
|
|
algorithms can only be used with bilevel data.</p>
|
2006-03-13 10:06:17 -05:00
|
|
|
<!-- 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
|
2005-03-06 06:11:43 -05:00
|
|
|
‘‘:’’-separated list to the
|
|
|
|
|
‘‘g3’’ option; e.g. <b>−c
|
2002-10-07 09:47:36 -04:00
|
|
|
g3:2d:fill</b> to get 2D-encoded data with byte-aligned EOL
|
2005-03-06 06:11:43 -05:00
|
|
|
codes.</p>
|
2006-03-13 10:06:17 -05:00
|
|
|
<!-- 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
|
2002-10-07 09:47:36 -04:00
|
|
|
differencing before it is encoded; a value of 1 forces each
|
|
|
|
|
scanline to be encoded without differencing. LZW-specific
|
2005-03-06 06:11:43 -05:00
|
|
|
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>
|
2006-03-13 10:06:17 -05:00
|
|
|
</td>
|
|
|
|
|
</table>
|
|
|
|
|
<!-- TABS -->
|
2003-11-27 10:07:01 -05:00
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
2006-03-13 10:06:17 -05:00
|
|
|
cols="5" cellspacing="0" cellpadding="0">
|
2003-11-27 10:07:01 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-03-13 10:06:17 -05:00
|
|
|
<td width="10%"></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<td width="3%">
|
2002-10-07 09:47:36 -04:00
|
|
|
|
2006-03-13 10:06:17 -05:00
|
|
|
<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
|
2007-02-24 10:03:47 -05:00
|
|
|
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>
|
2006-03-13 10:06:17 -05:00
|
|
|
</td>
|
|
|
|
|
<td width="0%">
|
|
|
|
|
</td>
|
2003-11-27 10:07:01 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-03-13 10:06:17 -05:00
|
|
|
<td width="10%"></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<td width="3%">
|
2002-10-07 09:47:36 -04:00
|
|
|
|
2006-03-13 10:06:17 -05:00
|
|
|
<p><b>−t</b></p>
|
|
|
|
|
</td>
|
|
|
|
|
<td width="5%"></td>
|
|
|
|
|
<td width="80%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-03-13 10:06:17 -05:00
|
|
|
<p>Set the threshold value for dithering. By default the
|
|
|
|
|
threshold value is 128.</p>
|
|
|
|
|
</td>
|
|
|
|
|
<td width="0%">
|
|
|
|
|
</td>
|
2005-03-06 06:11:43 -05:00
|
|
|
</table>
|
2002-10-07 09:47:36 -04:00
|
|
|
<a name="NOTES"></a>
|
|
|
|
|
<h2>NOTES</h2>
|
2006-03-13 10:06:17 -05:00
|
|
|
<!-- 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>
|
2002-10-07 09:47:36 -04:00
|
|
|
<a name="SEE ALSO"></a>
|
|
|
|
|
<h2>SEE ALSO</h2>
|
2006-03-13 10:06:17 -05:00
|
|
|
<!-- 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>
|
2002-10-07 09:47:36 -04:00
|
|
|
<hr>
|
|
|
|
|
</body>
|
|
|
|
|
</html>
|
