title: how to plot a pie of color list
body: <p>hi i have a dict with 3-int-tuple representing color (as key) and an int representing the numbers of occurences of that color in an image (as value)</p>
  
  <p>for exemple, this is a 4x4 pixels image with 3 colors:
  {(87, 82, 44): 1, (255, 245, 241): 11, (24, 13, 9): 4}</p>
  
  <p>i want to plot a pie chart of list [1,11,4] in which each slice of the piechart is colored with the right color.. how can i do?</p>