
<a name="l00064"></a>00064 
<a name="l00065"></a>00065 <span class="keyword">namespace </span>detail {
<a name="l00066"></a>00066 
<a name="l00068"></a>00068 
<a name="l00069"></a>00069 <span class="comment">// The default implementation of to_luminance uses float0..1 as the intermediate channel type</span>
<a name="l00070"></a>00070 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> RedChannel, <span class="keyword">typename</span> GreenChannel, <span class="keyword">typename<