import numpy as np
import cv2

img = cv2.imread("C:\Users\Administrator\Desktop\test.jpg")
print(img.shape)

for k in range(1000):
    i = int(np.random.random() * img.shape[1])
    j = int(np.random.random() * img.shape[0])

    img[j, i] = [255, 255, 255]
    img[j, i] = [255, 255, 255]
    img[
 
j, i] = [255, 255, 255]

cv2.imshow("img", img)
cv2.waitKey(0)
cv2.destroyAllWindows()