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<section id="tiffmedian">
<h1>tiffmedian<a class="headerlink" href="#tiffmedian" title="Permalink to this heading">¶</a></h1>
<section id="synopsis">
<h2>Synopsis<a class="headerlink" href="#synopsis" title="Permalink to this heading">¶</a></h2>
<p><strong>tiffmedian</strong> [ <em>options</em> ] <em>input.tif</em> <em>output.tif</em></p>
</section>
<section id="description">
<h2>Description<a class="headerlink" href="#description" title="Permalink to this heading">¶</a></h2>
<p><strong class="program">tiffmedian</strong> applies the median cut algorithm to an RGB
image in <em>input.tif</em> to generate a palette image that is written to
<em>output.tif</em>. 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>
</section>
<section id="options">
<h2>Options<a class="headerlink" href="#options" title="Permalink to this heading">¶</a></h2>
<dl class="std option">
<dt class="sig sig-object std" id="cmdoption-tiffmedian-c">
<span class="sig-name descname"><span class="pre">-c</span></span><span class="sig-prename descclassname"></span><a class="headerlink" href="#cmdoption-tiffmedian-c" title="Permalink to this definition">¶</a></dt>
<dd><p>Specify the compression to use for data written to the output file:
<strong class="command">-c none</strong> for no compression,
<strong class="command">-c packbits</strong> for PackBits compression,
<strong class="command">-c lzw</strong> for Lempel-Ziv & Welch compression,
<strong class="command">-c zip</strong> for Deflate compression.</p>
<p>By default <strong class="program">tiffmedian</strong> will compress data according to the
value of the <code class="docutils literal notranslate"><span class="pre">Compression</span></code> tag found in the source file.</p>
<p>LZW compression can be specified together with a <code class="docutils literal notranslate"><span class="pre">predictor</span></code> 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 <code class="docutils literal notranslate"><span class="pre">:</span></code>-separated
list to the <code class="docutils literal notranslate"><span class="pre">lzw</span></code> option; e.g. <code class="docutils literal notranslate"><span class="pre">-c</span> <span class="pre">lzw:2</span></code> for LZW compression
with horizontal differencing.</p>
</dd></dl>
<dl class="std option">
<dt class="sig sig-object std" id="cmdoption-tiffmedian-C">
<span class="sig-name descname"><span class="pre">-C</span></span><span class="sig-prename descclassname"></span><a class="headerlink" href="#cmdoption-tiffmedian-C" title="Permalink to this definition">¶</a></dt>
<dd><p>Specify the number of entries to use in the generated colormap.
By default all 256 entries/colors are used.</p>
</dd></dl>
<dl class="std option">
<dt class="sig sig-object std" id="cmdoption-tiffmedian-f">
<span class="sig-name descname"><span class="pre">-f</span></span><span class="sig-prename descclassname"></span><a class="headerlink" href="#cmdoption-tiffmedian-f" title="Permalink to this definition">¶</a></dt>
<dd><p>Apply Floyd-Steinberg dithering before selecting a colormap entry.</p>
</dd></dl>
<dl class="std option">
<dt class="sig sig-object std" id="cmdoption-tiffmedian-r">
<span class="sig-name descname"><span class="pre">-r</span></span><span class="sig-prename descclassname"></span><a class="headerlink" href="#cmdoption-tiffmedian-r" title="Permalink to this definition">¶</a></dt>
<dd><p>Specify the number of rows (scanlines) in each strip of data
written to the output file. By default, <strong class="program">tiffmedian</strong>
attempts to set the rows/strip that no more than 8 kilobytes of
data appear in a strip.</p>
</dd></dl>
</section>
<section id="notes">
<h2>Notes<a class="headerlink" href="#notes" title="Permalink to this heading">¶</a></h2>
<p>This program is derived from Paul Heckbert’s <strong class="program">median</strong> program.</p>
</section>
<section id="see-also">
<h2>See also<a class="headerlink" href="#see-also" title="Permalink to this heading">¶</a></h2>
<p><a class="reference internal" href="pal2rgb.html"><span class="doc">pal2rgb</span></a> (1),
<a class="reference internal" href="tiffinfo.html"><span class="doc">tiffinfo</span></a> (1),
<a class="reference internal" href="tiffcp.html"><span class="doc">tiffcp</span></a> (1),
<a class="reference internal" href="tiffcmp.html"><span class="doc">tiff2cmp</span></a> (1),
<a class="reference internal" href="../functions/libtiff.html"><span class="doc">libtiff</span></a> (3tiff),</p>
<p><strong>“Color Image Quantization for Frame Buffer Display”</strong>,
Paul Heckbert, SIGGRAPH proceedings, 1982, pp. 297-307.</p>
</section>
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<h3><a href="../index.html">Table of Contents</a></h3>
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<li><a class="reference internal" href="#">tiffmedian</a><ul>
<li><a class="reference internal" href="#synopsis">Synopsis</a></li>
<li><a class="reference internal" href="#description">Description</a></li>
<li><a class="reference internal" href="#options">Options</a></li>
<li><a class="reference internal" href="#notes">Notes</a></li>
<li><a class="reference internal" href="#see-also">See also</a></li>
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