151 lines
3.2 KiB
HTML
151 lines
3.2 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML><HEAD><TITLE>Manpage of TIFFMEDIAN</TITLE>
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</HEAD><BODY BGCOLOR=WHITE><FONT FACE="helvetica, sans, arial">
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<H1>TIFFMEDIAN</H1>
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Section: User Commands (1)<BR>Updated: October 15, 1995<BR><A HREF="#index">Index</A>
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<BR><A HREF="index.html">Return to Main Contents</A>
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<HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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tiffmedian - apply the median cut algorithm to data in a
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<FONT SIZE="-1">TIFF</FONT>
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file
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<B>tiffmedian</B>
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[
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<I>options</I>
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]
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<I>input.tif</I>
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<I>output.tif</I>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<I>tiffmedian</I>
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applys the median cut algorithm to an
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<FONT SIZE="-1">RGB</FONT>
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image in
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<I>input.tif</I>
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to generate a palette image that is written to
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<I>output.tif</I>.
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The generated colormap has, by default, 256 entries.
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The image data is quantized by mapping each
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pixel to the closest color values in the colormap.
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<A NAME="lbAE"> </A>
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<H2>OPTIONS</H2>
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<DL COMPACT>
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<DT><B>-c</B>
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<DD>
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Specify the compression to use for data written to the output file:
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<B>none </B>
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for no compression,
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<B>packbits</B>
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for PackBits compression,
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<B>lzw</B>
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for Lempel-Ziv & Welch compression,
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and
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<B>zip</B>
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for Deflate compression.
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By default
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<I>tiffmedian</I>
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will compress data according to the value of the
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<I>Compression</I>
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tag found in the source file.
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<DT><DD>
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<FONT SIZE="-1">LZW</FONT>
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compression can be specified together with a
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<I>predictor</I>
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value.
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A predictor value of 2 causes
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each scanline of the output image to undergo horizontal
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differencing before it is encoded; a value
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of 1 forces each scanline to be encoded without differencing.
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LZW-specific options are specified by appending a ``:''-separated
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list to the ``lzw'' option; e.g.
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<B>-c lzw:2</B>
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for
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<FONT SIZE="-1">LZW</FONT>
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compression with horizontal differencing.
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<DT><B>-C</B>
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<DD>
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Specify the number of entries to use in the generated colormap.
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By default all 256 entries/colors are used.
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<DT><B>-f</B>
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<DD>
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Apply Floyd-Steinberg dithering before selecting a colormap entry.
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<DT><B>-r</B>
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<DD>
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Specify the number of rows (scanlines) in each strip of data
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written to the output file.
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By default,
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<I>tiffmedian</I>
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attempts to set the rows/strip
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that no more than 8 kilobytes of data appear in a strip.
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</DL>
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<A NAME="lbAF"> </A>
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<H2>NOTES</H2>
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This program is derived from Paul Heckbert's
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<I>median</I>
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program.
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<A NAME="lbAG"> </A>
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<H2>SEE ALSO</H2>
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<I><A HREF="pal2rgb+1.html">pal2rgb</A></I>(1),
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<I><A HREF="tiffinfo+1.html">tiffinfo</A></I>(1),
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<I><A HREF="tiffcp+1.html">tiffcp</A></I>(1),
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<I><A HREF="tiffcmp+1.html">tiffcmp</A></I>(1),
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<I><A HREF="libtiff+3">libtiff</A></I>(3)
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<P>
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"Color Image Quantization for Frame Buffer Display", Paul
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Heckbert, SIGGRAPH proceedings, 1982, pp. 297-307.
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT><A HREF="#lbAB">NAME</A><DD>
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<DT><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT><A HREF="#lbAE">OPTIONS</A><DD>
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<DT><A HREF="#lbAF">NOTES</A><DD>
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<DT><A HREF="#lbAG">SEE ALSO</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="index.html">man2html</A>,
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using the manual pages.<BR>
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Time: 01:31:48 GMT, November 23, 1999
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</BODY>
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</HTML>
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