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11 <h1 align=center>TIFF2BW</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="#SEE ALSO">SEE ALSO</a><br>
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27 <p>tiff2bw − convert a color <small>TIFF</small> image
31 <a name="SYNOPSIS"></a>
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39 <p><b>tiff2bw</b> [ <i>options</i> ] <i>input.tif
43 <a name="DESCRIPTION"></a>
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51 <p><i>Tiff2bw</i> converts an <small>RGB</small> or Palette
52 color <small>TIFF</small> image to a greyscale image by
53 combining percentages of the red, green, and blue channels.
54 By default, output samples are created by taking 28% of the
55 red channel, 59% of the green channel, and 11% of the blue
56 channel. To alter these percentages, the <b>−R</b>,
57 <b>−G</b>, and <b>−B</b> options may be
61 <a name="OPTIONS"></a>
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70 <p><b>−c</b></p>
75 <p>Specify a compression scheme to use when writing image
76 data: <b>−c none</b> for no compression, <b>−c
77 packbits</b> for the PackBits compression algorithm,
78 <b>−c zip</b> for the Deflate compression algorithm,
79 <b>−c g3</b> for the CCITT Group 3 compression
80 algorithm, <b>−c g4</b> for the CCITT Group 4
81 compression algorithm, and <b>−c lzw</b> for
82 Lempel-Ziv & Welch (the default).</p>
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90 <p><b>−r</b></p>
95 <p>Write data with a specified number of rows per strip; by
96 default the number of rows/strip is selected so that each
97 strip is approximately 8 kilobytes.</p>
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102 <td width="10%"></td>
105 <p><b>−R</b></p>
110 <p>Specify the percentage of the red channel to use
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116 <td width="10%"></td>
119 <p><b>−G</b></p>
124 <p>Specify the percentage of the green channel to use
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130 <td width="10%"></td>
133 <p><b>−B</b></p>
138 <p>Specify the percentage of the blue channel to use
144 <a name="SEE ALSO"></a>
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152 <p><b>pal2rgb</b>(1), <b>tiffinfo</b>(1), <b>tiffcp</b>(1),
153 <b>tiffmedian</b>(1), <b>libtiff</b>(3)</p>
155 <p>Libtiff library home page:
156 <b>http://www.remotesensing.org/libtiff/</b></p>