pan><span class="p">)</span>
    <span class="n">image</span><span class="p">[</span><span class="n">idx</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">idx</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="p">:]</span> <span class="o">*=</span> <span class="mf">1.0</span> <span class="o">-</span> <span class="n">alpha</span>
    <span class="n">image</span><span class="p">[</span><span class="n">idx</span><span cla