PIL Functions

tostring

imgdata = img.tostring()

fromstring

img.fromstring(imgdata)
    or
img = Image.fromstring('RGB', (640, 480), imgdata)

getpixel

rgb = img.getpixel( (10, 31) )

putpixel

img.putpixel( (10, 31), (255, 255, 0) )