title: Why are histograms the same [python + simplecv]
body: <p>My question is why are the two histograms in following code the same.
  Because the picture does change, first show shows original picture and second shows completely black picture.</p>
  
  <p>Am I miss-using simpleCV or is this perhaps a bug?</p>
  
  <p>Code:</p>
  
  <pre><code>from itertools import product
  from SimpleCV import Image
  from SimpleCV import Color
  
  if __name__ == '__main__':
      pass
  
  def number_of_hues(picture):
      image = Image(picture)
  
      #convert the picture's space to HSV
      image = image.toHSV()
      image.show()
      original_histogram = image.histogram()
  
  
      (image_x_length, image_y_length) = image.size()
      for i,j in product(range(image_x_length), range(image_y_length)):
          image[i,j] = Color.BLACK
  
  
      image.show()
  
      new_histogram =  image.histogram()
  
      for o,n in zip(original_histogram, new_histogram):
          if o != n:
              print o,n
  </code></pre>