<span class="comment">// For instance 25 pixels of rgb2 type would be:</span></div><div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;    <span class="comment">// overall 25 pixels * 3 channels * 2 bits/channel = 150 bits</span></div><div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;    <span class="comment">// c = 18 bytes</span></div><div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;    <span class="comment">// r = 6 bits</