><span class="n">rgbr</span><span class="o">/</span><span class="n">rgbb</span><span class="p">)[</span><span class="mi">0</span><span class="p">])</span>
            <span class="n">rgba</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">dot</span><span class="p">(</span><span class="n">Mcat</span><span class="p">,</span><span class="n">rgb</span><span class="o">.</span><span class="n">T</span><span class="p">)</span><span class="o">.</span><span class="n">T</s