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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>21.7. colorsys — Conversions between color systems — Python v2.6.6 documentation</title> <link rel="stylesheet" href="../_static/default.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../', VERSION: '2.6.6', COLLAPSE_MODINDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python v2.6.6 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="top" title="Python v2.6.6 documentation" href="../index.html" /> <link rel="up" title="21. 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Multimedia Services</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <div class="section" id="module-colorsys"> <h1>21.7. <tt class="xref docutils literal"><span class="pre">colorsys</span></tt> — Conversions between color systems<a class="headerlink" href="#module-colorsys" title="Permalink to this headline">¶</a></h1> <p>The <tt class="xref docutils literal"><span class="pre">colorsys</span></tt> module defines bidirectional conversions of color values between colors expressed in the RGB (Red Green Blue) color space used in computer monitors and three other coordinate systems: YIQ, HLS (Hue Lightness Saturation) and HSV (Hue Saturation Value). Coordinates in all of these color spaces are floating point values. In the YIQ space, the Y coordinate is between 0 and 1, but the I and Q coordinates can be positive or negative. In all other spaces, the coordinates are all between 0 and 1.</p> <div class="admonition-see-also admonition seealso"> <p class="first admonition-title">See also</p> <p class="last">More information about color spaces can be found at <a class="reference external" href="http://www.poynton.com/ColorFAQ.html">http://www.poynton.com/ColorFAQ.html</a> and <a class="reference external" href="http://www.cambridgeincolour.com/tutorials/color-spaces.htm">http://www.cambridgeincolour.com/tutorials/color-spaces.htm</a>.</p> </div> <p>The <tt class="xref docutils literal"><span class="pre">colorsys</span></tt> module defines the following functions:</p> <dl class="function"> <dt id="colorsys.rgb_to_yiq"> <tt class="descclassname">colorsys.</tt><tt class="descname">rgb_to_yiq</tt><big>(</big><em>r</em>, <em>g</em>, <em>b</em><big>)</big><a class="headerlink" href="#colorsys.rgb_to_yiq" title="Permalink to this definition">¶</a></dt> <dd>Convert the color from RGB coordinates to YIQ coordinates.</dd></dl> <dl class="function"> <dt id="colorsys.yiq_to_rgb"> <tt class="descclassname">colorsys.</tt><tt class="descname">yiq_to_rgb</tt><big>(</big><em>y</em>, <em>i</em>, <em>q</em><big>)</big><a class="headerlink" href="#colorsys.yiq_to_rgb" title="Permalink to this definition">¶</a></dt> <dd>Convert the color from YIQ coordinates to RGB coordinates.</dd></dl> <dl class="function"> <dt id="colorsys.rgb_to_hls"> <tt class="descclassname">colorsys.</tt><tt class="descname">rgb_to_hls</tt><big>(</big><em>r</em>, <em>g</em>, <em>b</em><big>)</big><a class="headerlink" href="#colorsys.rgb_to_hls" title="Permalink to this definition">¶</a></dt> <dd>Convert the color from RGB coordinates to HLS coordinates.</dd></dl> <dl class="function"> <dt id="colorsys.hls_to_rgb"> <tt class="descclassname">colorsys.</tt><tt class="descname">hls_to_rgb</tt><big>(</big><em>h</em>, <em>l</em>, <em>s</em><big>)</big><a class="headerlink" href="#colorsys.hls_to_rgb" title="Permalink to this definition">¶</a></dt> <dd>Convert the color from HLS coordinates to RGB coordinates.</dd></dl> <dl class="function"> <dt id="colorsys.rgb_to_hsv"> <tt class="descclassname">colorsys.</tt><tt class="descname">rgb_to_hsv</tt><big>(</big><em>r</em>, <em>g</em>, <em>b</em><big>)</big><a class="headerlink" href="#colorsys.rgb_to_hsv" title="Permalink to this definition">¶</a></dt> <dd>Convert the color from RGB coordinates to HSV coordinates.</dd></dl> <dl class="function"> <dt id="colorsys.hsv_to_rgb"> <tt class="descclassname">colorsys.</tt><tt class="descname">hsv_to_rgb</tt><big>(</big><em>h</em>, <em>s</em>, <em>v</em><big>)</big><a class="headerlink" href="#colorsys.hsv_to_rgb" title="Permalink to this definition">¶</a></dt> <dd>Convert the color from HSV coordinates to RGB coordinates.</dd></dl> <p>Example:</p> <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">colorsys</span> <span class="gp">>>> </span><span class="n">colorsys</span><span class="o">.</span><span class="n">rgb_to_hsv</span><span class="p">(</span><span class="o">.</span><span class="mi">3</span><span class="p">,</span> <span class="o">.</span><span class="mi">4</span><span class="p">,</span> <span class="o">.</span><span class="mi">2</span><span class="p">)</span> <span class="go">(0.25, 0.5, 0.4)</span> <span class="gp">>>> </span><span class="n">colorsys</span><span class="o">.</span><span class="n">hsv_to_rgb</span><span class="p">(</span><span class="mf">0.25</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">,</span> <span class="mf">0.4</span><span class="p">)</span> <span class="go">(0.3, 0.4, 0.2)</span> </pre></div> </div> </div> </div> </div> </div> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="chunk.html" title="previous chapter">21.6. <tt class="docutils literal docutils literal"><span 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