#
# a q&d example of some fun things to do with images.
# this will create a black/white image based on a threshhold
# value, or laternatively turn a color image into a grayscale one
#
# comment/uncomment the relevant sections as needed.
#
# written by e.bonakdarian   nov 2010

import Image

BLACK = 0, 0, 0
WHITE = 255, 255, 255
THRESHHOLD = 110

im = Image.open('image.jpg')
ar = im.load()
rows = im.size[1]
cols = im.size[0]


for r in range(rows):
    for c in range(cols):
        pix = ar[c, r]
        avg = (pix[0] + pix[1] + pix[2]) / 3.0
        ar[c, r] = avg, avg, avg
##        if (avg > THRESHHOLD):
##            ar[c, r] = BLACK
##        else:
##            ar[c, r] = WHITE



im.show()