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<div class="section" id="module-colorsys">
<span id="colorsys-conversions-between-color-systems"></span><h1>21.6. <a class="reference internal" href="#module-colorsys" title="colorsys: Conversion functions between RGB and other color systems."><tt class="xref py py-mod docutils literal"><span class="pre">colorsys</span></tt></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="http://hg.python.org/cpython/file/3.2/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."><tt class="xref py py-mod docutils literal"><span class="pre">colorsys</span></tt></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-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 <a class="reference internal" href="#module-colorsys" title="colorsys: Conversion functions between RGB and other color systems."><tt class="xref py py-mod docutils literal"><span class="pre">colorsys</span></tt></a> 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><p>Convert the color from RGB coordinates to YIQ coordinates.</p>
</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><p>Convert the color from YIQ coordinates to RGB coordinates.</p>
</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><p>Convert the color from RGB coordinates to HLS coordinates.</p>
</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><p>Convert the color from HLS coordinates to RGB coordinates.</p>
</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><p>Convert the color from RGB coordinates to HSV coordinates.</p>
</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><p>Convert the color from HSV coordinates to RGB coordinates.</p>
</dd></dl>
<p>Example:</p>
<div class="highlight-python3"><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>
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