对于一张彩色图像image.jpg，通过opencv读取其灰度图，下面的方法正确的是（）。
A: img = cv2.imread('image.jpg')gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY);
B: gray = cv2.imread('image.jpg',0);
C: gray = cv2.imread('image.jpg',1)；
D: gray = cv2.imread('image.jpg',cv2.IMREAD_GRAYSCALE)；
A: img = cv2.imread('image.jpg')gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY);
B: gray = cv2.imread('image.jpg',0);
C: gray = cv2.imread('image.jpg',1)；
D: gray = cv2.imread('image.jpg',cv2.IMREAD_GRAYSCALE)；
举一反三
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