[wxWidgets.git] / src / tiff / html / man / tiffdither.1.html

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<title>TIFFDITHER</title>
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<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>
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<p>tiffdither &minus; convert a greyscale image to bilevel
using dithering</p>
</td>
</table>
<a name="SYNOPSIS"></a>
<h2>SYNOPSIS</h2>
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<p><b>tiffdither</b> [ <i>options</i> ] <i>input.tif
output.tif</i></p>
</td>
</table>
<a name="DESCRIPTION"></a>
<h2>DESCRIPTION</h2>
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<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>
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<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>
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<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 FillOrder tag set to <small>LSB2MSB ,</small> while
<b>&minus;f msb2lsb</b> will force data to be written with
the FillOrder 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>
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<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>
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<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>
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<p>Libtiff library home page:
<b>http://www.remotesensing.org/libtiff/</b></p>
</td>
</table>
<hr>
</body>
</html>
Commit	Line	Data
8414a40c VZ	1	<!-- Creator : groff version 1.18.1 -->
	2	<!-- CreationDate: Mon Mar 13 18:03:13 2006 -->
	3	<html>
	4	<head>
	5	<meta name="generator" content="groff -Thtml, see www.gnu.org">
	6	<meta name="Content-Style" content="text/css">
	7	<title>TIFFDITHER</title>
	8	</head>
	9	<body>
	10
	11	<h1 align=center>TIFFDITHER</h1>
	12	<a href="#NAME">NAME</a><br>
	13	<a href="#SYNOPSIS">SYNOPSIS</a><br>
	14	<a href="#DESCRIPTION">DESCRIPTION</a><br>
	15	<a href="#OPTIONS">OPTIONS</a><br>
	16	<a href="#NOTES">NOTES</a><br>
	17	<a href="#SEE ALSO">SEE ALSO</a><br>
	18
	19	<hr>
	20	<a name="NAME"></a>
	21	<h2>NAME</h2>
	22	<!-- INDENTATION -->
	23	<table width="100%" border=0 rules="none" frame="void"
	24	cols="2" cellspacing="0" cellpadding="0">
	25	<tr valign="top" align="left">
	26	<td width="8%"></td>
	27	<td width="91%">
	28	<p>tiffdither − convert a greyscale image to bilevel
	29	using dithering</p>
	30	</td>
	31	</table>
	32	<a name="SYNOPSIS"></a>
	33	<h2>SYNOPSIS</h2>
	34	<!-- INDENTATION -->
	35	<table width="100%" border=0 rules="none" frame="void"
	36	cols="2" cellspacing="0" cellpadding="0">
	37	<tr valign="top" align="left">
	38	<td width="8%"></td>
	39	<td width="91%">
	40	<p><b>tiffdither</b> [ <i>options</i> ] <i>input.tif
	41	output.tif</i></p>
	42	</td>
	43	</table>
	44	<a name="DESCRIPTION"></a>
	45	<h2>DESCRIPTION</h2>
	46	<!-- INDENTATION -->
	47	<table width="100%" border=0 rules="none" frame="void"
	48	cols="2" cellspacing="0" cellpadding="0">
	49	<tr valign="top" align="left">
	50	<td width="8%"></td>
	51	<td width="91%">
	52	<p><i>tiffdither</i> converts a single channel 8-bit
	53	greyscale image to a bilevel image using Floyd-Steinberg
	54	error propagation with thresholding.</p>
	55	</td>
	56	</table>
	57	<a name="OPTIONS"></a>
	58	<h2>OPTIONS</h2>
	59	<!-- TABS -->
	60	<table width="100%" border=0 rules="none" frame="void"
	61	cols="5" cellspacing="0" cellpadding="0">
	62	<tr valign="top" align="left">
	63	<td width="10%"></td>
	64	<td width="2%">
65
66	<p><b>−c</b></p>
67	</td>
68	<td width="6%"></td>
69	<td width="80%">
70
71	<p>Specify the compression to use for data written to the
72	output file: <b>none</b> for no compression, <b>packbits</b>
73	for PackBits compression, <b>lzw</b> for Lempel-Ziv &
74	Welch compression, <b>zip</b> for Deflate compression,
75	<b>g3</b> for CCITT Group 3 (T.4) compression, and <b>g4</b>
76	for CCITT Group 4 (T.6) compression. By default
77	<i>tiffdither</i> will compress data according to the value
78	of the <i>Compression</i> tag found in the source file.</p>
79	</td>
80	<td width="0%">
81	</td>
82	</table>
83	<!-- INDENTATION -->
84	<table width="100%" border=0 rules="none" frame="void"
85	cols="2" cellspacing="0" cellpadding="0">
86	<tr valign="top" align="left">
87	<td width="17%"></td>
88	<td width="82%">
89	<p>The <small>CCITT</small> Group 3 and Group 4 compression
90	algorithms can only be used with bilevel data.</p>
91	<!-- INDENTATION -->
92	<p>Group 3 compression can be specified together with
93	several T.4-specific options: <b>1d</b> for 1-dimensional
94	encoding, <b>2d</b> for 2-dimensional encoding, and
95	<b>fill</b> to force each encoded scanline to be zero-filled
96	so that the terminating EOL code lies on a byte boundary.
97	Group 3-specific options are specified by appending a
98	‘‘:’’-separated list to the
99	‘‘g3’’ option; e.g. <b>−c
100	g3:2d:fill</b> to get 2D-encoded data with byte-aligned EOL
101	codes.</p>
102	<!-- INDENTATION -->
103	<p><small>LZW</small> compression can be specified together
104	with a <i>predictor</i> value. A predictor value of 2 causes
105	each scanline of the output image to undergo horizontal
106	differencing before it is encoded; a value of 1 forces each
107	scanline to be encoded without differencing. LZW-specific
108	options are specified by appending a
109	‘‘:’’-separated list to the
110	‘‘lzw’’ option; e.g. <b>−c
111	lzw:2</b> for <small>LZW</small> compression with horizontal
112	differencing.</p>
113	</td>
114	</table>
115	<!-- TABS -->
116	<table width="100%" border=0 rules="none" frame="void"
117	cols="5" cellspacing="0" cellpadding="0">
118	<tr valign="top" align="left">
119	<td width="10%"></td>
120	<td width="3%">
121
122	<p><b>−f</b></p>
123	</td>
124	<td width="5%"></td>
125	<td width="80%">
126
127	<p>Specify the bit fill order to use in writing output
128	data. By default, <i>tiffdither</i> will create a new file
129	with the same fill order as the original. Specifying
130	<b>−f lsb2msb</b> will force data to be written with
131	the FillOrder tag set to <small>LSB2MSB ,</small> while
132	<b>−f msb2lsb</b> will force data to be written with
133	the FillOrder tag set to <small>MSB2LSB .</small></p>
134	</td>
135	<td width="0%">
136	</td>
137	<tr valign="top" align="left">
138	<td width="10%"></td>
139	<td width="3%">
140
141	<p><b>−t</b></p>
142	</td>
143	<td width="5%"></td>
144	<td width="80%">
145
146	<p>Set the threshold value for dithering. By default the
147	threshold value is 128.</p>
148	</td>
149	<td width="0%">
150	</td>
151	</table>
152	<a name="NOTES"></a>
153	<h2>NOTES</h2>
154	<!-- INDENTATION -->
155	<table width="100%" border=0 rules="none" frame="void"
156	cols="2" cellspacing="0" cellpadding="0">
157	<tr valign="top" align="left">
158	<td width="8%"></td>
159	<td width="91%">
160	<p>The dither algorithm is taken from the
161	<b>tiffmedian</b>(1) program (written by Paul Heckbert).</p>
162	</td>
163	</table>
164	<a name="SEE ALSO"></a>
165	<h2>SEE ALSO</h2>
166	<!-- INDENTATION -->
167	<table width="100%" border=0 rules="none" frame="void"
168	cols="2" cellspacing="0" cellpadding="0">
169	<tr valign="top" align="left">
170	<td width="8%"></td>
171	<td width="91%">
172	<p><b>pal2rgb</b>(1), <b>fax2tiff</b>(1),
173	<b>tiffinfo</b>(1), <b>tiffcp</b>(1), <b>tiff2bw</b>(1),
174	<b>libtiff</b>(3TIFF)</p>
175	<!-- INDENTATION -->
176	<p>Libtiff library home page:
177	<b>http://www.remotesensing.org/libtiff/</b></p>
178	</td>
179	</table>
180	<hr>
181	</body>
182	</html>