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<H1>TIFFMEDIAN</H1>
Section: User Commands  (1)<BR>Updated: October 15, 1995<BR><A HREF="#index">Index</A>
<BR><A HREF="index.html">Return to Main Contents</A>
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<A NAME="lbAB">&nbsp;</A>
<H2>NAME</H2>

tiffmedian - apply the median cut algorithm to data in a
<FONT SIZE="-1">TIFF</FONT>
file
<A NAME="lbAC">&nbsp;</A>
<H2>SYNOPSIS</H2>

<B>tiffmedian</B>

[
<I>options</I>

]
<I>input.tif</I>

<I>output.tif</I>

<A NAME="lbAD">&nbsp;</A>
<H2>DESCRIPTION</H2>

<I>tiffmedian</I>

applys the median cut algorithm to an
<FONT SIZE="-1">RGB</FONT>
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.
<A NAME="lbAE">&nbsp;</A>
<H2>OPTIONS</H2>

<DL COMPACT>
<DT><B>-c</B>

<DD>
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.
<DT><DD>
<FONT SIZE="-1">LZW</FONT>
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
<FONT SIZE="-1">LZW</FONT>
compression with horizontal differencing.
<DT><B>-C</B>

<DD>
Specify the number of entries to use in the generated colormap.
By default all 256 entries/colors are used.
<DT><B>-f</B>

<DD>
Apply Floyd-Steinberg dithering before selecting a colormap entry.
<DT><B>-r</B>

<DD>
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.
</DL>
<A NAME="lbAF">&nbsp;</A>
<H2>NOTES</H2>

This program is derived from Paul Heckbert's
<I>median</I>

program.
<A NAME="lbAG">&nbsp;</A>
<H2>SEE ALSO</H2>

<I><A HREF="pal2rgb+1.html">pal2rgb</A></I>(1),

<I><A HREF="tiffinfo+1.html">tiffinfo</A></I>(1),

<I><A HREF="tiffcp+1.html">tiffcp</A></I>(1),

<I><A HREF="tiffcmp+1.html">tiffcmp</A></I>(1),

<I><A HREF="libtiff+3">libtiff</A></I>(3)

<P>

&quot;Color Image Quantization for Frame Buffer Display&quot;, Paul
Heckbert, SIGGRAPH proceedings, 1982, pp. 297-307.

<HR>
<A NAME="index">&nbsp;</A><H2>Index</H2>
<DL>
<DT><A HREF="#lbAB">NAME</A><DD>
<DT><A HREF="#lbAC">SYNOPSIS</A><DD>
<DT><A HREF="#lbAD">DESCRIPTION</A><DD>
<DT><A HREF="#lbAE">OPTIONS</A><DD>
<DT><A HREF="#lbAF">NOTES</A><DD>
<DT><A HREF="#lbAG">SEE ALSO</A><DD>
</DL>
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