title: Followup: Finding an accurate "distance" between colors
body: <p><a href="https://stackoverflow.com/questions/180/function-for-creating-color-wheels">Original Question</a></p>
  
  <p>I am looking for a function that attempts to quantify how "distant" (or distinct) two colors are. This question is really in two parts: </p>
  
  <ol>
  <li>What color space best represents human vision?</li>
  <li>What distance metric in that space best represents human vision (euclidean?)</li>
  </ol>