title: How to determine if a color is close to another color
body: <p>I am creating a kind of color tool and this tool should tell me if color is close to another color,
  For example:</p>
  <pre><code>Color[] colors = new colors[] { Color.FromArgb(0,0,255), Color.FromArgb(0,109,251)};
  //colors[0] IS BLUE
  //colors[1] IS BRIGHTER BLUE (#006DFB)
  bool TheyClose = ColorsAreClose(colors[0],colors[1]); //TRUE BLUE IS CLOSE
  //TheyColse Should Be = TURE
  </code></pre>
  <p>How should a <code>ColorsAreClose()</code> function Look?</p>