<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8" /> <title>colorsys — Conversions between color systems — Python 3.7.4 documentation</title> <link rel="stylesheet" href="../_static/pydoctheme.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript" id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <script type="text/javascript" src="../_static/language_data.js"></script> <script type="text/javascript" src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python 3.7.4 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="next" title="imghdr — Determine the type of an image" href="imghdr.html" /> <link rel="prev" title="chunk — Read IFF chunked data" href="chunk.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <link rel="canonical" href="https://docs.python.org/3/library/colorsys.html" /> <script type="text/javascript" src="../_static/copybutton.js"></script> <script type="text/javascript" src="../_static/switchers.js"></script> <style> @media only screen { table.full-width-table { width: 100%; } } </style> </head><body> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="imghdr.html" title="imghdr — Determine the type of an image" accesskey="N">next</a> |</li> <li class="right" > <a href="chunk.html" title="chunk — Read IFF chunked data" accesskey="P">previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <span class="language_switcher_placeholder">en</span> <span class="version_switcher_placeholder">3.7.4</span> <a href="../index.html">Documentation </a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li> <li class="nav-item nav-item-2"><a href="mm.html" accesskey="U">Multimedia Services</a> »</li> <li class="right"> <div class="inline-search" style="display: none" role="search"> <form class="inline-search" action="../search.html" method="get"> <input placeholder="Quick search" type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> <script type="text/javascript">$('.inline-search').show(0);</script> | </li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <div class="section" id="module-colorsys"> <span id="colorsys-conversions-between-color-systems"></span><h1><a class="reference internal" href="#module-colorsys" title="colorsys: Conversion functions between RGB and other color systems."><code class="xref py py-mod docutils literal notranslate"><span class="pre">colorsys</span></code></a> — Conversions between color systems<a class="headerlink" href="#module-colorsys" title="Permalink to this headline">¶</a></h1> <p><strong>Source code:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/3.7/Lib/colorsys.py">Lib/colorsys.py</a></p> <hr class="docutils" /> <p>The <a class="reference internal" href="#module-colorsys" title="colorsys: Conversion functions between RGB and other color systems."><code class="xref py py-mod docutils literal notranslate"><span class="pre">colorsys</span></code></a> 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 seealso"> <p class="admonition-title">See also</p> <p>More information about color spaces can be found at <a class="reference external" href="http://poynton.ca/ColorFAQ.html">http://poynton.ca/ColorFAQ.html</a> and <a class="reference external" href="https://www.cambridgeincolour.com/tutorials/color-spaces.htm">https://www.cambridgeincolour.com/tutorials/color-spaces.htm</a>.</p> </div> <p>The <a class="reference internal" href="#module-colorsys" title="colorsys: Conversion functions between RGB and other color systems."><code class="xref py py-mod docutils literal notranslate"><span class="pre">colorsys</span></code></a> module defines the following functions:</p> <dl class="function"> <dt id="colorsys.rgb_to_yiq"> <code class="descclassname">colorsys.</code><code class="descname">rgb_to_yiq</code><span class="sig-paren">(</span><em>r</em>, <em>g</em>, <em>b</em><span class="sig-paren">)</span><a class="headerlink" href="#colorsys.rgb_to_yiq" title="Permalink to this definition">¶</a></dt> <dd><p>Convert the color from RGB coordinates to YIQ coordinates.</p> </dd></dl> <dl class="function"> <dt id="colorsys.yiq_to_rgb"> <code class="descclassname">colorsys.</code><code class="descname">yiq_to_rgb</code><span class="sig-paren">(</span><em>y</em>, <em>i</em>, <em>q</em><span class="sig-paren">)</span><a class="headerlink" href="#colorsys.yiq_to_rgb" title="Permalink to this definition">¶</a></dt> <dd><p>Convert the color from YIQ coordinates to RGB coordinates.</p> </dd></dl> <dl class="function"> <dt id="colorsys.rgb_to_hls"> <code class="descclassname">colorsys.</code><code class="descname">rgb_to_hls</code><span class="sig-paren">(</span><em>r</em>, <em>g</em>, <em>b</em><span class="sig-paren">)</span><a class="headerlink" href="#colorsys.rgb_to_hls" title="Permalink to this definition">¶</a></dt> <dd><p>Convert the color from RGB coordinates to HLS coordinates.</p> </dd></dl> <dl class="function"> <dt id="colorsys.hls_to_rgb"> <code class="descclassname">colorsys.</code><code class="descname">hls_to_rgb</code><span class="sig-paren">(</span><em>h</em>, <em>l</em>, <em>s</em><span class="sig-paren">)</span><a class="headerlink" href="#colorsys.hls_to_rgb" title="Permalink to this definition">¶</a></dt> <dd><p>Convert the color from HLS coordinates to RGB coordinates.</p> </dd></dl> <dl class="function"> <dt id="colorsys.rgb_to_hsv"> <code class="descclassname">colorsys.</code><code class="descname">rgb_to_hsv</code><span class="sig-paren">(</span><em>r</em>, <em>g</em>, <em>b</em><span class="sig-paren">)</span><a class="headerlink" href="#colorsys.rgb_to_hsv" title="Permalink to this definition">¶</a></dt> <dd><p>Convert the color from RGB coordinates to HSV coordinates.</p> </dd></dl> <dl class="function"> <dt id="colorsys.hsv_to_rgb"> <code class="descclassname">colorsys.</code><code class="descname">hsv_to_rgb</code><span class="sig-paren">(</span><em>h</em>, <em>s</em>, <em>v</em><span class="sig-paren">)</span><a class="headerlink" href="#colorsys.hsv_to_rgb" title="Permalink to this definition">¶</a></dt> <dd><p>Convert the color from HSV coordinates to RGB coordinates.</p> </dd></dl> <p>Example:</p> <div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><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="mf">0.2</span><span class="p">,</span> <span class="mf">0.4</span><span class="p">,</span> <span class="mf">0.4</span><span class="p">)</span> <span class="go">(0.5, 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">0.5</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">(0.2, 0.4, 0.4)</span> </pre></div> </div> </div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="chunk.html" title="previous chapter"><code class="xref py py-mod docutils literal notranslate"><span class="pre">chunk</span></code> — Read IFF chunked data</a></p> <h4>Next topic</h4> <p class="topless"><a href="imghdr.html" title="next chapter"><code class="xref py py-mod docutils literal notranslate"><span class="pre">imghdr</span></code> — Determine the type of an image</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../bugs.html">Report a Bug</a></li> <li> <a href="https://github.com/python/cpython/blob/3.7/Doc/library/colorsys.rst" rel="nofollow">Show Source </a> </li> </ul> 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