pan>

            <span class="c1"># apply naka-rushton compression:</span>
            <span class="n">rgbc</span> <span class="o">=</span> <span class="n">naka_rushton</span><span class="p">(</span><span class="n">rgba</span><span class="p">,</span> <span class="n">n</span> <span class="o">=</span> <span class="n">naka</span><span class="p">[</span><span class="s1">&#39;n&#39;</span><span class="p">],</span> <span class="n">sig</span> <span class="o">=</span> <span class="n">naka</span><span class="p">[</