generate binay image python

img=cv2.imread('<image path>')

gray_img=cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)

import numpy as np
from numpy import random

# Generating an image of values between 1 and 255. 
im_thresh = random.randint(1,256, (64,64))

# Set anything less than 255 to 0. Unnecessary if cv2 does this during threshold. 
# Must go before the operation below in order not to set all values to 0. 
im_thresh[im_thresh<255] = 0

# Set all values at indices where the array equals 255 to 1.
im_thresh[im_thresh==255] = 1

img=cv2.imread('<image path>')gray_img=cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)