olor,<span class="stringliteral">&#39;double&#39;</span>)</div><div class="line"><a name="l00470"></a><span class="lineno">  470</span>&#160;    gray = 0.30*color(:,:,1) + 0.59*color(:,:,2) + 0.11*color(:,:,3);</div><div class="line"><a name="l00471"></a><span class="lineno">  471</span>&#160;    color(:,:,1) = gray;</div><div class="line"><a name="l00472"></a><span class="lineno">  472</span>&#160;    color(:,:,2) = gray;</div><div class="line"><a name="l00473"></a><span class="lineno">  473</span>&#160;  