><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;</div><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;<span class="keyword">using</span> gray1_image_t = bit_aligned_image1_type&lt;1, gray_layout_t&gt;::type;</div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<span class="keyword">using</span> gray2_image_t = bit_aligned_image1_type&lt;2, gray_layout_t&gt;::type;</div><div class="line"><a name="l00046"></a><span clas