title: Measuring Euclidean Distance on pixel level with PIL / Image.Point()
body: <p>I am using Python Image Library to get a sort of brightness value for each pixel, based on its Euclidean Distance measured from white.<br>
  From what I can discern from PIL's documentation, <code>Image.point()</code> manipulates each pixel according to a color table. But what I need is a way to reach each pixel's value in a way similar to this: <code>pixel.r</code> <code>pixel.g</code>  <code>pixel.b</code> in order to use them to fit the calculation to the distance formula.</p>
  
  <p>I'm new to PIL, and its documentation is a bit fuzzy. Is <code>Image.point()</code> up to a task like this? If not, where else might I look?</p>