   15</a></span>&#160;<span class="preprocessor">#define IMAGE_TYPES(X)                                                \</span></div><div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="preprocessor">  X(background_color, &quot;background/color&quot;)                             \</span></div><div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="preprocessor">  X(background_color_levels, &quot;background/color_levels&quot;)          