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<li><a class="reference internal" href="#">Specifying Colors</a><ul>
<li><a class="reference internal" href="#cn-color-selection"><code class="docutils literal"><span class="pre">'CN'</span></code> color selection</a></li>
<li><a class="reference internal" href="#xkcd-v-x11-css4">xkcd v X11/CSS4</a></li>
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<div class="section" id="specifying-colors">
<span id="colors"></span><h1>Specifying Colors<a class="headerlink" href="#specifying-colors" title="Permalink to this headline">¶</a></h1>
<p>In almost all places in matplotlib where a color can be specified by the user
it can be provided as:</p>
<ul class="simple">
<li>an RGB or RGBA tuple of float values in <code class="docutils literal"><span class="pre">[0,</span> <span class="pre">1]</span></code>
(e.g., <code class="docutils literal"><span class="pre">(0.1,</span> <span class="pre">0.2,</span> <span class="pre">0.5)</span></code> or <code class="docutils literal"><span class="pre">(0.1,</span> <span class="pre">0.2,</span> <span class="pre">0.5,</span> <span class="pre">0.3)</span></code>)</li>
<li>a hex RGB or RGBA string (e.g., <code class="docutils literal"><span class="pre">'#0F0F0F'</span></code> or <code class="docutils literal"><span class="pre">'#0F0F0F0F'</span></code>)</li>
<li>a string representation of a float value in <code class="docutils literal"><span class="pre">[0,</span> <span class="pre">1]</span></code>
inclusive for gray level (e.g., <code class="docutils literal"><span class="pre">'0.5'</span></code>)</li>
<li>one of <code class="docutils literal"><span class="pre">{'b',</span> <span class="pre">'g',</span> <span class="pre">'r',</span> <span class="pre">'c',</span> <span class="pre">'m',</span> <span class="pre">'y',</span> <span class="pre">'k',</span> <span class="pre">'w'}</span></code></li>
<li>a X11/CSS4 color name</li>
<li>a name from the <a class="reference external" href="https://xkcd.com/color/rgb/">xkcd color survey</a>
prefixed with <code class="docutils literal"><span class="pre">'xkcd:'</span></code> (e.g., <code class="docutils literal"><span class="pre">'xkcd:sky</span> <span class="pre">blue'</span></code>)</li>
<li>one of <code class="docutils literal"><span class="pre">{'C0',</span> <span class="pre">'C1',</span> <span class="pre">'C2',</span> <span class="pre">'C3',</span> <span class="pre">'C4',</span> <span class="pre">'C5',</span> <span class="pre">'C6',</span> <span class="pre">'C7',</span> <span class="pre">'C8',</span> <span class="pre">'C9'}</span></code></li>
<li>one of <code class="docutils literal"><span class="pre">{'tab:blue',</span> <span class="pre">'tab:orange',</span> <span class="pre">'tab:green',</span>
<span class="pre">'tab:red',</span> <span class="pre">'tab:purple',</span> <span class="pre">'tab:brown',</span> <span class="pre">'tab:pink',</span>
<span class="pre">'tab:gray',</span> <span class="pre">'tab:olive',</span> <span class="pre">'tab:cyan'}</span></code> which are the Tableau Colors from the
‘T10’ categorical palette (which is the default color cycle).</li>
</ul>
<p>All string specifications of color are case-insensitive.</p>
<div class="section" id="cn-color-selection">
<h2><code class="docutils literal"><span class="pre">'CN'</span></code> color selection<a class="headerlink" href="#cn-color-selection" title="Permalink to this headline">¶</a></h2>
<p>Color can be specified by a string matching the regex <code class="docutils literal"><span class="pre">C[0-9]</span></code>.
This can be passed any place that a color is currently accepted and
can be used as a ‘single character color’ in format-string to
<code class="xref py py-obj docutils literal"><span class="pre">matplotlib.Axes.plot</span></code>.</p>
<p>The single digit is the index into the default property cycle
(<code class="docutils literal"><span class="pre">matplotlib.rcParams['axes.prop_cycle']</span></code>). If the property cycle does not
include <code class="docutils literal"><span class="pre">'color'</span></code> then black is returned. The color is evaluated when the
artist is created. For example,</p>
<div class="highlight-python"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">numpy</span> <span class="kn">as</span> <span class="nn">np</span>
<span class="kn">import</span> <span class="nn">matplotlib.pyplot</span> <span class="kn">as</span> <span class="nn">plt</span>
<span class="kn">import</span> <span class="nn">matplotlib</span> <span class="kn">as</span> <span class="nn">mpl</span>
<span class="n">th</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">linspace</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="o">*</span><span class="n">np</span><span class="o">.</span><span class="n">pi</span><span class="p">,</span> <span class="mi">128</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">demo</span><span class="p">(</span><span class="n">sty</span><span class="p">):</span>
<span class="n">mpl</span><span class="o">.</span><span class="n">style</span><span class="o">.</span><span class="n">use</span><span class="p">(</span><span class="n">sty</span><span class="p">)</span>
<span class="n">fig</span><span class="p">,</span> <span class="n">ax</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">subplots</span><span class="p">(</span><span class="n">figsize</span><span class="o">=</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">3</span><span class="p">))</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_title</span><span class="p">(</span><span class="s1">'style: {!r}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">sty</span><span class="p">),</span> <span class="n">color</span><span class="o">=</span><span class="s1">'C0'</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">th</span><span class="p">,</span> <span class="n">np</span><span class="o">.</span><span class="n">cos</span><span class="p">(</span><span class="n">th</span><span class="p">),</span> <span class="s1">'C1'</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="s1">'C1'</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">th</span><span class="p">,</span> <span class="n">np</span><span class="o">.</span><span class="n">sin</span><span class="p">(</span><span class="n">th</span><span class="p">),</span> <span class="s1">'C2'</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="s1">'C2'</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">legend</span><span class="p">()</span>
<span class="n">demo</span><span class="p">(</span><span class="s1">'default'</span><span class="p">)</span>
<span class="n">demo</span><span class="p">(</span><span class="s1">'seaborn'</span><span class="p">)</span>
</pre></div>
</div>
<p>(<a class="reference external" href="../users/colors-1.py">Source code</a>)</p>
<div class="figure" id="id1">
<img alt="../_images/colors-1_00.png" src="../_images/colors-1_00.png" />
<p class="caption"><span class="caption-text">(<a class="reference external" href="../users/colors-1_00.png">png</a>, <a class="reference external" href="../users/colors-1_00.pdf">pdf</a>)</span></p>
</div>
<div class="figure" id="id2">
<img alt="../_images/colors-1_01.png" src="../_images/colors-1_01.png" />
<p class="caption"><span class="caption-text">(<a class="reference external" href="../users/colors-1_01.png">png</a>, <a class="reference external" href="../users/colors-1_01.pdf">pdf</a>)</span></p>
</div>
<p>will use the first color for the title and then plot using the second
and third colors of each style’s <code class="docutils literal"><span class="pre">mpl.rcParams['axes.prop_cycle']</span></code>.</p>
</div>
<div class="section" id="xkcd-v-x11-css4">
<h2>xkcd v X11/CSS4<a class="headerlink" href="#xkcd-v-x11-css4" title="Permalink to this headline">¶</a></h2>
<p>The xkcd colors are derived from a user survey conducted by the
webcomic xkcd. <a class="reference external" href="https://blog.xkcd.com/2010/05/03/color-survey-results/">Details of the survey are available on the xkcd blog</a>.</p>
<p>Out of 148 colors in the CSS color list, there are 95 name collisions
between the X11/CSS4 names and the xkcd names, all but 3 of which have
different hex values. For example <code class="docutils literal"><span class="pre">'blue'</span></code> maps to <code class="docutils literal"><span class="pre">'#0000FF'</span></code>
where as <code class="docutils literal"><span class="pre">'xkcd:blue'</span></code> maps to <code class="docutils literal"><span class="pre">'#0343DF'</span></code>. Due to these name
collisions all of the xkcd colors have <code class="docutils literal"><span class="pre">'xkcd:'</span></code> prefixed. As noted in
the blog post, while it might be interesting to re-define the X11/CSS4 names
based on such a survey, we do not do so unilaterally.</p>
<p>The name collisions are shown in the table below; the color names
where the hex values agree are shown in bold.</p>
<p>(<a class="reference external" href="../users/colors-2.py">Source code</a>, <a class="reference external" href="../users/colors-2.png">png</a>, <a class="reference external" href="../users/colors-2.pdf">pdf</a>)</p>
<div class="figure">
<img alt="../_images/colors-2.png" src="../_images/colors-2.png" />
</div>
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