t class="col-md-4"> <samp>hue</samp></dt><dd class="col-md-8"> pixel hue</dd>
<dt class="col-md-4"> <samp>saturation</samp></dt><dd class="col-md-8"> pixel saturation</dd>
<dt class="col-md-4"> <samp>lightness</samp></dt><dd class="col-md-8"> pixel lightness; equivalent to 0.5*max(red,green,blue) + 0.5*min(red,green,blue)</dd>
<dt class="col-md-4"> <samp>luminance</samp></dt><dd class="col-md-8"> pixel luminance; equivalent to <samp>0.212656*red + 0.715158*green + 0.072186*blue</samp></dd>
<dt class="col-md