Python 2.7.10 (default, May 23 2015, 09:40:32) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> s = "Hello"
>>> reversed(s)
<reversed object at 0x00DE2C70>
>>> print (reversed(s))
<reversed object at 0x025012F0>
>>> for i in reversed(s):
...     print i
...
o
l
l
e
H
>>>

for y in range(h):
	for x in range(w):
		r, g, b = data[x, y]
		rC = R[0]
		R = R[1:]
		gC = G[0]
		G = G[1:]
		bC = B[0]
		B = B[1:]
		data[x, y] = tuple(map(lambda x: int((x / sc) % 256), [(r + rC), (g + gC), (b + bC)]))

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  ---./|\.---
  '._/ | \_.'
_.-'_'.|.'_'-._
 '-._.'|'._.-'
  .' \ | / '.
  ---'\|/'---
       ' Starshine