| 1 | <!-- Creator : groff version 1.18.1 -->
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| 2 | <!-- CreationDate: Fri Jul 13 17:43:19 2007 -->
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| 3 | <html>
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| 4 | <head>
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| 5 | <meta name="generator" content="groff -Thtml, see www.gnu.org">
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| 6 | <meta name="Content-Style" content="text/css">
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| 7 | <title>TIFFDITHER</title>
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| 8 | </head>
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| 9 | <body>
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| 10 |
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| 11 | <h1 align=center>TIFFDITHER</h1>
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| 12 | <a href="#NAME">NAME</a><br>
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| 13 | <a href="#SYNOPSIS">SYNOPSIS</a><br>
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| 14 | <a href="#DESCRIPTION">DESCRIPTION</a><br>
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| 15 | <a href="#OPTIONS">OPTIONS</a><br>
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| 16 | <a href="#NOTES">NOTES</a><br>
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| 17 | <a href="#SEE ALSO">SEE ALSO</a><br>
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| 18 |
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| 19 | <hr>
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| 20 | <a name="NAME"></a>
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| 21 | <h2>NAME</h2>
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| 22 | <!-- INDENTATION -->
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| 23 | <table width="100%" border=0 rules="none" frame="void"
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| 24 | cols="2" cellspacing="0" cellpadding="0">
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| 25 | <tr valign="top" align="left">
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| 26 | <td width="8%"></td>
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| 27 | <td width="91%">
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| 28 | <p>tiffdither − convert a greyscale image to bilevel
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| 29 | using dithering</p>
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| 30 | </td>
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| 31 | </table>
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| 32 | <a name="SYNOPSIS"></a>
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| 33 | <h2>SYNOPSIS</h2>
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| 34 | <!-- INDENTATION -->
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| 35 | <table width="100%" border=0 rules="none" frame="void"
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| 36 | cols="2" cellspacing="0" cellpadding="0">
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| 37 | <tr valign="top" align="left">
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| 38 | <td width="8%"></td>
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| 39 | <td width="91%">
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| 40 | <p><b>tiffdither</b> [ <i>options</i> ] <i>input.tif
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| 41 | output.tif</i></p>
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| 42 | </td>
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| 43 | </table>
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| 44 | <a name="DESCRIPTION"></a>
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| 45 | <h2>DESCRIPTION</h2>
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| 46 | <!-- INDENTATION -->
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| 47 | <table width="100%" border=0 rules="none" frame="void"
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| 48 | cols="2" cellspacing="0" cellpadding="0">
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| 49 | <tr valign="top" align="left">
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| 50 | <td width="8%"></td>
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| 51 | <td width="91%">
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| 52 | <p><i>tiffdither</i> converts a single channel 8-bit
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| 53 | greyscale image to a bilevel image using Floyd-Steinberg
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| 54 | error propagation with thresholding.</p>
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| 55 | </td>
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| 56 | </table>
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| 57 | <a name="OPTIONS"></a>
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| 58 | <h2>OPTIONS</h2>
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| 59 | <!-- TABS -->
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| 60 | <table width="100%" border=0 rules="none" frame="void"
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| 61 | cols="5" cellspacing="0" cellpadding="0">
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| 62 | <tr valign="top" align="left">
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| 63 | <td width="10%"></td>
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| 64 | <td width="2%">
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| 65 |
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| 66 | <p><b>−c</b></p>
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| 67 | </td>
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| 68 | <td width="6%"></td>
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| 69 | <td width="80%">
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| 70 |
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| 71 | <p>Specify the compression to use for data written to the
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| 72 | output file: <b>none</b> for no compression, <b>packbits</b>
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| 73 | for PackBits compression, <b>lzw</b> for Lempel-Ziv &
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| 74 | Welch compression, <b>zip</b> for Deflate compression,
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| 75 | <b>g3</b> for CCITT Group 3 (T.4) compression, and <b>g4</b>
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| 76 | for CCITT Group 4 (T.6) compression. By default
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| 77 | <i>tiffdither</i> will compress data according to the value
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| 78 | of the <i>Compression</i> tag found in the source file.</p>
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| 79 | </td>
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| 80 | <td width="0%">
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| 81 | </td>
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| 82 | </table>
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| 83 | <!-- INDENTATION -->
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| 84 | <table width="100%" border=0 rules="none" frame="void"
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| 85 | cols="2" cellspacing="0" cellpadding="0">
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| 86 | <tr valign="top" align="left">
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| 87 | <td width="17%"></td>
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| 88 | <td width="82%">
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| 89 | <p>The <small>CCITT</small> Group 3 and Group 4 compression
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| 90 | algorithms can only be used with bilevel data.</p>
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| 91 | <!-- INDENTATION -->
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| 92 | <p>Group 3 compression can be specified together with
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| 93 | several T.4-specific options: <b>1d</b> for 1-dimensional
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| 94 | encoding, <b>2d</b> for 2-dimensional encoding, and
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| 95 | <b>fill</b> to force each encoded scanline to be zero-filled
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| 96 | so that the terminating EOL code lies on a byte boundary.
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| 97 | Group 3-specific options are specified by appending a
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| 98 | ‘‘:’’-separated list to the
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| 99 | ‘‘g3’’ option; e.g. <b>−c
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| 100 | g3:2d:fill</b> to get 2D-encoded data with byte-aligned EOL
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| 101 | codes.</p>
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| 102 | <!-- INDENTATION -->
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| 103 | <p><small>LZW</small> compression can be specified together
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| 104 | with a <i>predictor</i> value. A predictor value of 2 causes
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| 105 | each scanline of the output image to undergo horizontal
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| 106 | differencing before it is encoded; a value of 1 forces each
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| 107 | scanline to be encoded without differencing. LZW-specific
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| 108 | options are specified by appending a
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| 109 | ‘‘:’’-separated list to the
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| 110 | ‘‘lzw’’ option; e.g. <b>−c
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| 111 | lzw:2</b> for <small>LZW</small> compression with horizontal
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| 112 | differencing.</p>
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| 113 | </td>
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| 114 | </table>
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| 115 | <!-- TABS -->
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| 116 | <table width="100%" border=0 rules="none" frame="void"
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| 117 | cols="5" cellspacing="0" cellpadding="0">
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| 118 | <tr valign="top" align="left">
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| 119 | <td width="10%"></td>
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| 120 | <td width="3%">
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| 121 |
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| 122 | <p><b>−f</b></p>
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| 123 | </td>
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| 124 | <td width="5%"></td>
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| 125 | <td width="80%">
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| 126 |
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| 127 | <p>Specify the bit fill order to use in writing output
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| 128 | data. By default, <i>tiffdither</i> will create a new file
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| 129 | with the same fill order as the original. Specifying
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| 130 | <b>−f lsb2msb</b> will force data to be written with
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| 131 | the <i>FillOrder</i> tag set to <small>LSB2MSB ,</small>
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| 132 | while <b>−f msb2lsb</b> will force data to be written
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| 133 | with the <i>Fill- Order</i> tag set to <small>MSB2LSB
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| 134 | .</small></p>
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| 135 | </td>
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| 136 | <td width="0%">
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| 137 | </td>
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| 138 | <tr valign="top" align="left">
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| 139 | <td width="10%"></td>
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| 140 | <td width="3%">
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| 141 |
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| 142 | <p><b>−t</b></p>
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| 143 | </td>
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| 144 | <td width="5%"></td>
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| 145 | <td width="80%">
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| 146 |
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| 147 | <p>Set the threshold value for dithering. By default the
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| 148 | threshold value is 128.</p>
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| 149 | </td>
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| 150 | <td width="0%">
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| 151 | </td>
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| 152 | </table>
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| 153 | <a name="NOTES"></a>
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| 154 | <h2>NOTES</h2>
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| 155 | <!-- INDENTATION -->
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| 156 | <table width="100%" border=0 rules="none" frame="void"
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| 157 | cols="2" cellspacing="0" cellpadding="0">
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| 158 | <tr valign="top" align="left">
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| 159 | <td width="8%"></td>
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| 160 | <td width="91%">
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| 161 | <p>The dither algorithm is taken from the
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| 162 | <b>tiffmedian</b>(1) program (written by Paul Heckbert).</p>
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| 163 | </td>
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| 164 | </table>
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| 165 | <a name="SEE ALSO"></a>
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| 166 | <h2>SEE ALSO</h2>
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| 167 | <!-- INDENTATION -->
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| 168 | <table width="100%" border=0 rules="none" frame="void"
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| 169 | cols="2" cellspacing="0" cellpadding="0">
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| 170 | <tr valign="top" align="left">
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| 171 | <td width="8%"></td>
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| 172 | <td width="91%">
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| 173 | <p><b>pal2rgb</b>(1), <b>fax2tiff</b>(1),
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| 174 | <b>tiffinfo</b>(1), <b>tiffcp</b>(1), <b>tiff2bw</b>(1),
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| 175 | <b>libtiff</b>(3TIFF)</p>
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| 176 | <!-- INDENTATION -->
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| 177 | <p>Libtiff library home page:
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| 178 | <b>http://www.remotesensing.org/libtiff/</b></p>
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| 179 | </td>
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| 180 | </table>
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| 181 | <hr>
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| 182 | </body>
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| 183 | </html>
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