Python: Calculating the average color of an area of an image (PIL)

Here's a snippet of code I whipped up in Python to calculate the the average color of a square shaped area of an image.  I used the Python Imaging Library (PIL) to load the image, so be sure to have it available if you're using this.

import Image

def get_average_color((x,y), n, image):
    """ Returns a 3-tuple containing the RGB value of the average color of the
    given square bounded area of length = n whose origin (top left corner) 
    is (x, y) in the given image"""

    r, g, b = 0, 0, 0
    count = 0
    for s in range(x, x+n+1):
        for t in range(y, y+n+1):
            pixlr, pixlg, pixlb = image[s, t]
            r += pixlr
            g += pixlg
            b += pixlb
            count += 1
    return ((r/count), (g/count), (b/count))

image = Image.open('test.png').load()
r, g, b = get_average_color((24,290), 50, image)
print r,g,b

This is great for detecting the color of an area of an animated and constantly changing game screen, where finding the color of a single pixel may not be accurate enough for your needs.