import numpy as np
import cv2

black = np.zeros([150, 200, 1], 'uint8')
cv2.imshow('Black', black)
print(black[0, 0, :])

ones = np.ones([150, 200, 3], 'uint8')
cv2.imshow('Ones', ones)
print(ones[0, 0, :])

white = np.ones([150, 200, 3], 'uint16')
white *= (2**16-1)
cv2.imshow('White', white)
print(white[0, 0, :])

cv2.waitKey(0)
cv2.destroyAllWindows()
