g to access their elements.</p>
<p>Example: </p>
<div class="fragment"><div class="line"><span class="comment">// 16-bit BGR pixel, 4 bits for the blue, 3 bits for the green, 2 bits for the red channel and 7 unused bits</span></div>
<div class="line"><span class="keyword">typedef</span> packed_pixel_type&lt;uint16_t, mpl::vector3_c&lt;unsigned,4,3,2&gt;, bgr_layout_t&gt;::type bgr432_pixel_t;</div>
<div class="line"></div>
<div class="line"><span class="comment">// A reference to its red channel. Although t