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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>
<hr>
<h2>NAME
<a name="NAME"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">tiffmedian
− apply the median cut algorithm to data in a
<small>TIFF</small> file</p>
<h2>SYNOPSIS
<a name="SYNOPSIS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>tiffmedian</b>
[ <i>options</i> ] <i>input.tif output.tif</i></p>
<h2>DESCRIPTION
<a name="DESCRIPTION"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><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>
<h2>OPTIONS
<a name="OPTIONS"></a>
</h2>
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<p style="margin-top: 1em"><b>−c</b></p></td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em">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 & 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></td></tr>
</table>
<p style="margin-left:22%; margin-top: 1em"><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
‘‘:’’-separated list to the
‘‘lzw’’ option; e.g. <b>−c
lzw:2</b> for <small>LZW</small> compression with horizontal
differencing.</p>
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cellspacing="0" cellpadding="0">
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<td width="11%"></td>
<td width="3%">
<p style="margin-top: 1em"><b>−C</b></p></td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em">Specify the number of entries to
use in the generated colormap. By default all 256
entries/colors are used.</p></td></tr>
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<td width="11%"></td>
<td width="3%">
<p><b>−f</b></p></td>
<td width="8%"></td>
<td width="78%">
<p>Apply Floyd-Steinberg dithering before selecting a
colormap entry.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p><b>−r</b></p></td>
<td width="8%"></td>
<td width="78%">
<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></td></tr>
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<h2>NOTES
<a name="NOTES"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">This program is
derived from Paul Heckbert’s <i>median</i>
program.</p>
<h2>SEE ALSO
<a name="SEE ALSO"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>pal2rgb</b>(1),
<b>tiffinfo</b>(1), <b>tiffcp</b>(1), <b>tiffcmp</b>(1),
<b>libtiff</b>(3TIFF)</p>
<p style="margin-left:11%; margin-top: 1em"><b>Color Image
Quantization for Frame Buffer Display</b>, Paul Heckbert,
SIGGRAPH proceedings, 1982, pp. 297-307.</p>
<p style="margin-left:11%; margin-top: 1em">Libtiff library
home page: <b>http://www.simplesystems.org/libtiff/</b></p>
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