class="keyword">using</span> gray_alpha32f_image_t = image&lt;gray_alpha32f_pixel_t, false&gt;;</div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;<span class="keyword">using</span> gray_alpha32f_planar_image_t = image&lt;gray_alpha32f_pixel_t, true&gt;;</div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;<span class="keyword">using</span> gray_alpha64f_image_t = image&lt;gray_alpha64f_pixel_t, false&gt;;</div><div class="line"><a name="l00071">