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<title>TIFF2BW</title>
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<h1 align=center>TIFF2BW</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="#SEE ALSO">SEE ALSO</a><br>
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<a name="NAME"></a>
<h2>NAME</h2>
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<p>tiff2bw − convert a color <small>TIFF</small> image
to greyscale</p>
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<a name="SYNOPSIS"></a>
<h2>SYNOPSIS</h2>
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<p><b>tiff2bw</b> [ options ] <i>input.tif
output.tif</i></p>
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<h2>DESCRIPTION</h2>
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<p><i>Tiff2bw</i> converts an <small>RGB</small> or Palette
color <small>TIFF</small> image to a greyscale image by
combining percentages of the red, green, and blue channels.
By default, output samples are created by taking 28% of the
red channel, 59% of the green channel, and 11% of the blue
channel. To alter these percentages, the <b>−R</b>,
<b>−G</b>, and <b>−B</b> options may be
used.</p>
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<a name="OPTIONS"></a>
<h2>OPTIONS</h2>
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<p><b>−c</b></p>
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<p>Specify a compression scheme to use when writing image
data: <b>−c none</b> for no compression, <b>-c
packbits</b> for the PackBits compression algorithm, <b>-c
zip</b> for the Deflate compression algorithm, <b>-c g3</b>
for the CCITT Group 3 compression algorithm, <b>-c g4</b>
for the CCITT Group 4 compression algorithm, and <b>−c
lzw</b> for Lempel-Ziv & Welch (the default).</p>
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<p><b>−r</b></p>
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<td width="5%"></td>
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<p>Write data with a specified number of rows per strip; by
default the number of rows/strip is selected so that each
strip is approximately 8 kilobytes.</p>
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<p><b>−R</b></p>
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<p>Specify the percentage of the red channel to use
(default 28).</p>
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<p><b>−G</b></p>
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<p>Specify the percentage of the green channel to use
(default 59).</p>
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<p><b>−B</b></p>
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<td width="5%"></td>
<td width="80%">
<p>Specify the percentage of the blue channel to use
(default 11).</p>
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<a name="SEE ALSO"></a>
<h2>SEE ALSO</h2>
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<p><b>pal2rgb</b>(1), <b>tiffinfo</b>(1), <b>tiffcp</b>(1),
<b>tiffmedian</b>(1), <b>libtiff</b>(3)</p>
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<p>Libtiff library home page:
<b>http://www.remotesensing.org/libtiff/</b></p>
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