title: Increase or decrease color saturation
body: <p>I would like to know the algorithm to increase or decrease one RGB color saturation</p>
  
  <p>for example if I have the color <code>rgb(200, 30, 40)</code> (red) the function stub would be</p>
  
  <pre><code>function Saturation(color, factor)
  where color.r = 200, color.g= 30 and color.b=40
  </code></pre>
  
  <p>Anyone knows a library or has a code snippet that does that?</p>