#!/bin/python

# to maintain compatibility with future versions of Python
from __future__ import absolute_import, division, print_function

import cv2

i = cv2.imread('PathToFile')
cv2.imshow('Color',i)
i = cv2.cvtColor(i, cv2.COLOR_RGB2GRAY)
cv2.imshow('Grayscale',i)
cv2.waitKey(0)
cv2.destroyAllWindows()
cv2.imwrite('PathToFile', i)