cv2.imread()
cv2.imshow()
cv2.imwrite()

# -*- coding: utf-8 -*-
import numpy as np
import cv2

img = cv2.imread('lena.jpg',0)

cv2.imshow('image',img)
cv2.waitKey(0)
cv2.destroyAllWindows()

import numpy as np
import cv2
cv2.namedWindow('image', cv2.WINDOW_NORMAL)
cv2.imshow('image',img)
cv2.waitKey(0)
cv2.destroyAllWindows()

cv2.imwrite('messigray.png',img)

import numpy as np
import cv2
img = cv2.imread('messi5.jpg',0)
cv2.imshow('image',img)

k = cv2.waitKey(0)

if k == 27: # wait for ESC key to exit
	cv2.destroyAllWindows()
elif k == ord('s'): # wait for 's' key to save and exit
	cv2.imwrite('messigray.png',img)
	cv2.destroyAllWindows()

#open img with Matplotlib
import numpy as np
import cv2
from matplotlib import pyplot as plt

img = cv2.imread('lena.jpg',0)
plt.imshow(img, cmap = 'gray', interpolation = 'bicubic')
plt.xticks([]), plt.yticks([]) # to hide tick values on X and Y axis
plt.show()

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