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<title>TIFFMEDIAN</title>
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<h1 align=center>TIFFMEDIAN</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>

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<a name="NAME"></a>
<h2>NAME</h2>
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<p>tiffmedian &minus; apply the median cut algorithm to data
in a <small>TIFF</small> file</p>
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<a name="SYNOPSIS"></a>
<h2>SYNOPSIS</h2>
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<p><b>tiffmedian</b> [ <i>options</i> ] <i>input.tif
output.tif</i></p>
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<h2>DESCRIPTION</h2>
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<p><i>tiffmedian</i> applies the median cut algorithm to an
<small>RGB</small> image in <i>input.tif</i> to generate a
palette image that is written to <i>output.tif</i>. The
generated colormap has, by default, 256 entries. The image
data is quantized by mapping each pixel to the closest color
values in the colormap.</p>
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<a name="OPTIONS"></a>
<h2>OPTIONS</h2>
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<p><b>&minus;c</b></p>
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<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, and <b>zip</b> for Deflate compression.
By default <i>tiffmedian</i> will compress data according to
the value of the <i>Compression</i> tag found in the source
file.</p>
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<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>
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<p><b>&minus;C</b></p>
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<p>Specify the number of entries to use in the generated
colormap. By default all 256 entries/colors are used.</p>
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<p><b>&minus;f</b></p>
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<p>Apply Floyd-Steinberg dithering before selecting a
colormap entry.</p>
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<p><b>&minus;r</b></p>
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<p>Specify the number of rows (scanlines) in each strip of
data written to the output file. By default,
<i>tiffmedian</i> attempts to set the rows/strip that no
more than 8 kilobytes of data appear in a strip.</p>
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<h2>NOTES</h2>
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<p>This program is derived from Paul Heckbert&rsquo;s
<i>median</i> program.</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>tiffcmp</b>(1), <b>libtiff</b>(3TIFF)</p>
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<p><b>Color Image Quantization for Frame Buffer Display</b>,
Paul Heckbert, SIGGRAPH proceedings, 1982, pp. 297-307.</p>
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<p>Libtiff library home page:
<b>http://www.remotesensing.org/libtiff/</b></p>
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