184 lines
5.0 KiB
HTML
184 lines
5.0 KiB
HTML
<!-- Creator : groff version 1.18.1 -->
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<!-- CreationDate: Sat Feb 24 18:37:20 2007 -->
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<html>
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<head>
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<meta name="generator" content="groff -Thtml, see www.gnu.org">
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<meta name="Content-Style" content="text/css">
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<title>TIFFMEDIAN</title>
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</head>
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<body>
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<h1 align=center>TIFFMEDIAN</h1>
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<a href="#NAME">NAME</a><br>
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<a href="#SYNOPSIS">SYNOPSIS</a><br>
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<a href="#DESCRIPTION">DESCRIPTION</a><br>
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<a href="#OPTIONS">OPTIONS</a><br>
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<a href="#NOTES">NOTES</a><br>
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<a href="#SEE ALSO">SEE ALSO</a><br>
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<hr>
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<a name="NAME"></a>
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<h2>NAME</h2>
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cols="2" cellspacing="0" cellpadding="0">
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<td width="8%"></td>
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<td width="91%">
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<p>tiffmedian − apply the median cut algorithm to data
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in a <small>TIFF</small> file</p>
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</td>
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</table>
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<a name="SYNOPSIS"></a>
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<h2>SYNOPSIS</h2>
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<td width="8%"></td>
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<p><b>tiffmedian</b> [ <i>options</i> ] <i>input.tif
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output.tif</i></p>
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</td>
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</table>
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<a name="DESCRIPTION"></a>
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<h2>DESCRIPTION</h2>
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<p><i>tiffmedian</i> applies the median cut algorithm to an
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<small>RGB</small> image in <i>input.tif</i> to generate a
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palette image that is written to <i>output.tif</i>. The
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generated colormap has, by default, 256 entries. The image
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data is quantized by mapping each pixel to the closest color
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values in the colormap.</p>
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</td>
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</table>
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<a name="OPTIONS"></a>
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<h2>OPTIONS</h2>
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<!-- TABS -->
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cols="5" cellspacing="0" cellpadding="0">
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<td width="11%"></td>
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<td width="2%">
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<p><b>−c</b></p>
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</td>
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<td width="5%"></td>
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<td width="80%">
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<p>Specify the compression to use for data written to the
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output file: <b>none</b> for no compression, <b>packbits</b>
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for PackBits compression, <b>lzw</b> for Lempel-Ziv &
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Welch compression, and <b>zip</b> for Deflate compression.
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By default <i>tiffmedian</i> will compress data according to
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the value of the <i>Compression</i> tag found in the source
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file.</p>
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</td>
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<td width="0%">
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</td>
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</table>
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<td width="17%"></td>
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<td width="82%">
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<p><small>LZW</small> compression can be specified together
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with a <i>predictor</i> value. 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 of 1 forces each
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scanline to be encoded without differencing. LZW-specific
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options are specified by appending a
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‘‘:’’-separated list to the
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‘‘lzw’’ option; e.g. <b>−c
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lzw:2</b> for <small>LZW</small> compression with horizontal
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differencing.</p>
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</td>
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</table>
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<!-- TABS -->
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<table width="100%" border=0 rules="none" frame="void"
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cols="5" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td>
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<td width="2%">
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<p><b>−C</b></p>
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</td>
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<td width="6%"></td>
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<td width="80%">
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<p>Specify the number of entries to use in the generated
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colormap. By default all 256 entries/colors are used.</p>
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</td>
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<td width="0%">
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</td>
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<tr valign="top" align="left">
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<td width="10%"></td>
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<td width="2%">
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<p><b>−f</b></p>
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</td>
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<td width="6%"></td>
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<td width="80%">
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<p>Apply Floyd-Steinberg dithering before selecting a
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colormap entry.</p>
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</td>
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<td width="0%">
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</td>
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<tr valign="top" align="left">
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<td width="10%"></td>
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<td width="2%">
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<p><b>−r</b></p>
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</td>
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<td width="6%"></td>
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<td width="80%">
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<p>Specify the number of rows (scanlines) in each strip of
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data written to the output file. By default,
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<i>tiffmedian</i> attempts to set the rows/strip that no
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more than 8 kilobytes of data appear in a strip.</p>
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</td>
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<td width="0%">
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</td>
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</table>
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<a name="NOTES"></a>
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<h2>NOTES</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="8%"></td>
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<td width="91%">
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<p>This program is derived from Paul Heckbert’s
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<i>median</i> program.</p>
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</td>
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</table>
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<a name="SEE ALSO"></a>
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<h2>SEE ALSO</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="8%"></td>
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<td width="91%">
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<p><b>pal2rgb</b>(1), <b>tiffinfo</b>(1), <b>tiffcp</b>(1),
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<b>tiffcmp</b>(1), <b>libtiff</b>(3TIFF)</p>
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<!-- INDENTATION -->
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<p><b>Color Image Quantization for Frame Buffer Display</b>,
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Paul Heckbert, SIGGRAPH proceedings, 1982, pp. 297-307.</p>
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<p>Libtiff library home page:
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<b>http://www.simplesystems.org/libtiff/</b></p>
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</td>
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</table>
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<hr>
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</body>
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</html>
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