Add commented code to crop image

It is commented as it does not seem to be finally what we are looking
for.

datasets/raise/generate_histogram.py

@@ -15,6 +15,8 @@ def getColor(colorIntensity, colorIndex):
 
 def getHistogram(fileName):
     image = Image.open(fileName)
+    #image = image.crop((1, 1, 2, 2))
+    #print(image.size)
 
     histogram = image.histogram()