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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>
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<a name="NAME"></a>
<h2>NAME</h2>
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tiffmedian - apply the median cut algorithm to data in a <small>TIFF</small> file</td></table>
<a name="SYNOPSIS"></a>
<h2>SYNOPSIS</h2>
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<b>tiffmedian</b> [ <i>options</i> ] <i>input.tif
output.tif</i></td></table>
<a name="DESCRIPTION"></a>
<h2>DESCRIPTION</h2>
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<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.</td></table>
<a name="OPTIONS"></a>
<h2>OPTIONS</h2>
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<b>-c</b></td></table>
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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.</td></table>
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<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.</td></table>
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<b>-C</b></td></table>
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Specify the number of entries to use in the generated
colormap. By default all 256 entries/colors are
used.</td></table>
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<b>-f</b></td></table>
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Apply Floyd-Steinberg dithering before selecting a colormap
entry.</td></table>
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<b>-r</b></td></table>
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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.</td></table>
<a name="NOTES"></a>
<h2>NOTES</h2>
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This program is derived from Paul Heckbert's <i>median</i>
program.</td></table>
<a name="SEE ALSO"></a>
<h2>SEE ALSO</h2>
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<i>pal2rgb</i>(1), <i>tiffinfo</i>(1), <i>tiffcp</i>(1),
<i>tiffcmp</i>(1), <i>libtiff</i>(3)</td></table>
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"Color Image Quantization for Frame Buffer
Display", Paul Heckbert, SIGGRAPH proceedings, 1982,
pp. 297-307.</td></table>
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