/span><span class="n">dot</span><span class="p">(</span><span class="n">invMAab</span><span class="p">,</span> <span class="n">Aab</span><span class="o">.</span><span class="n">T</span><span class="p">)</span><span class="o">.</span><span class="n">T</span>    

            <span class="c1"># decompress rgbc to (adapted) rgba :</span>
            <span class="n">rgba</span> <span class="o">=</span> <span class="n">naka_rushton</span><span class="p">(</span><span class="n">rgbc</span><span class="p">,</span>