'''CountColorOccurrences.py
'''
IMG = pmOpenImage(0, "Earth.jpg")

colorCounts = {} # Create an empty dictionary
# Now use it to count the number of pixels of each color.
for y in range(pmGetImageHeight(IMG)):
  for x in range(pmGetImageWidth(IMG)):
    color = pmGetPixel(IMG, x, y) # Get the pixel's color.
    try:
      count = colorCounts[color] # Retrieve current count.
    except KeyError:
      count = 0 # No count yet, make it zero.
    colorCounts[color] = count + 1 # Add one.

itemList = colorCounts.items()
print "This image has "+str(len(itemList))+" unique colors."
itemList.sort(key=lambda item: -item[1])
print "The most common color is "+str(itemList[0][0])
print " which occurs "+str(itemList[0][1])+" times."
print "Here is the complete list of colors and their counts:"
print itemList