import cv2 as cv
import numpy as np
def color_space_demo():
image = cv.imread("D:/C++opencv_program/hello opencv/hello opencv/bdog.png")
blank = np.zeros_like(image)
cv.imshow("blank",blank)
blank = np.copy(image)
cv.imshow("blank", blank)
cv.waitKey(0)
cv.destroyAllWindows()
if __name__ == "__main__":
color_space_demo()
输出结果为一张图片,即bdog.png的这张图片是为什么呢,理应不是应该先输出一张空白图片再输出第二张图片吗?