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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>GDAL: rgb2pct.py</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.5.1 --><div class="tabs">  <ul>    <li><a href="index.html"><span>Main&nbsp;Page</span></a></li>    <li><a href="annotated.html"><span>Classes</span></a></li>    <li><a href="files.html"><span>Files</span></a></li>    <li><a href="pages.html"><span>Related&nbsp;Pages</span></a></li>  </ul></div><h1><a class="anchor" name="rgb2pct">rgb2pct.py</a></h1>converts an image into a pseudo-colored image<p> Usage: <p><div class="fragment"><pre class="fragment">rgb2pct.py [-n colors] [-of format] source_file dest_file</pre></div><p>This utility will compute an optimal pseudo-color table for a given RGB image using a median cut algorithm on a downsampled RGB histogram. Then it converts the image into a pseudo-colored image using the color table. This conversion utilizes Floyd-Steinberg dithering (error diffusion) to maximize output image visual quality.<p><dl><dt><b>-n</b> <em>colors</em>:</dt><dd>Select the number of colors in the generated color table. Defaults to 256. Must be between 2 and 256.  </dd><dt><b>-of</b> <em>format</em>:</dt><dd>Format to generated (defaults to GeoTIFF). Same semantics as the <b>-of</b> flag for gdal_translate. Only output formats supporting pseudocolor tables should be used.  </dd><dt><em>source_file</em>:</dt><dd>The input RGB file.  </dd><dt><em>dest_file</em>:</dt><dd>The output pseudo-colored file that will be created. </dd></dl><p>NOTE: rgb2pct.py is a Python script, and will only work if GDAL was built with Python support. <hr>Generated for GDAL by <a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.1.</body></html>

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