numpy.zeros()与numpy.ones()

import numpy as np
import cv2

# 建立全黑的彩色画布
img1 = np.zeros([300, 300, 3], dtype=np.uint8)
cv2.imshow("img1", img1)

# 建立全黑的灰度
img2 = np.zeros([300, 300, 1], dtype=np.uint8)
cv2.imshow("img2", img2)

# 白色画布
img3 = np.ones([300, 300, 3], dtype=np.uint8)
img3 *= 255
cv2.imshow("img3", img3)

cv2.waitKey(0)
cv2.destroyAllWindows()