e</span> T&gt; <span class="keyword">struct </span>is_pixel&lt;const T&gt; : <span class="keyword">public</span> is_pixel&lt;T&gt; {};
<a name="l00055"></a>00055 
<a name="l00058"></a>00058 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> PixelBased&gt;
<a name="l00059"></a><a class="code" href="g_i_l_0581.html">00059</a> <span class="keyword">struct </span><a class="code" href="g_i_l_0581.html" title="Returns the number of channels of a pixel-based GIL construct.">num_channel