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OpenCV之那些年我走过的坑

1.OpenCV保存的单通道图会变成3通道

eg:

img = cv2.imread('image.jpg')
b = img[:,:,0]
print("此时为单通道:", b.shape)
cv2.imwrite('image_b.jpg',b)
b = cv2.imread('image_b.jpg')
print("此时为三通道:", b.shape)
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