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<title>TIFF2BW</title>
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<h1 align=center>TIFF2BW</h1>
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<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>
<hr>
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<a name="NAME"></a>
<h2>NAME</h2>
<p style="margin-left:11%; margin-top: 1em">tiff2bw &minus;
convert a color <small>TIFF</small> image to greyscale</p>
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<a name="SYNOPSIS"></a>
<h2>SYNOPSIS</h2>
<p style="margin-left:11%; margin-top: 1em"><b>tiff2bw</b>
[ options ] <i>input.tif output.tif</i></p>
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<a name="DESCRIPTION"></a>
<h2>DESCRIPTION</h2>
<p style="margin-left:11%; margin-top: 1em"><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
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channel. To alter these percentages, the <b>&minus;R</b>,
<b>&minus;G</b>, and <b>&minus;B</b> options may be
used.</p>
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<a name="OPTIONS"></a>
<h2>OPTIONS</h2>
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<table width="100%" border=0 rules="none" frame="void"
cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
<td width="11%"></td>
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<td width="3%">
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<p style="margin-top: 1em" valign="top"><b>&minus;c</b></p> </td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Specify a
compression scheme to use when writing image data:
<b>&minus;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>&minus;c lzw</b>
for Lempel-Ziv &amp; Welch (the default).</p></td>
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<tr valign="top" align="left">
<td width="11%"></td>
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<td width="3%">
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<p style="margin-top: 1em" valign="top"><b>&minus;r</b></p> </td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">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> </td>
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<tr valign="top" align="left">
<td width="11%"></td>
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<td width="3%">
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<p style="margin-top: 1em" valign="top"><b>&minus;R</b></p> </td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Specify the
percentage of the red channel to use (default 28).</p></td>
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<tr valign="top" align="left">
<td width="11%"></td>
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<td width="3%">
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<p style="margin-top: 1em" valign="top"><b>&minus;G</b></p> </td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Specify the
percentage of the green channel to use (default 59).</p></td>
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<tr valign="top" align="left">
<td width="11%"></td>
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<td width="3%">
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<p style="margin-top: 1em" valign="top"><b>&minus;B</b></p> </td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em" valign="top">Specify the
percentage of the blue channel to use (default 11).</p></td>
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</table>
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<a name="SEE ALSO"></a>
<h2>SEE ALSO</h2>
<p style="margin-left:11%; margin-top: 1em"><b>pal2rgb</b>(1),
<b>tiffinfo</b>(1), <b>tiffcp</b>(1), <b>tiffmedian</b>(1),
<b>libtiff</b>(3)</p>
<p style="margin-left:11%; margin-top: 1em">Libtiff library
home page: <b>http://www.remotesensing.org/libtiff/</b></p>
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