Read shape of image
image:np.ndarray = cv2.imread("cow.jpg")
print(image.shape)
Output
(559, 838, 3)
Show one channel
image: np.ndarray = cv2.imread("cow.jpg")
# channels : BGR => 0,1,2
image2 = image[:, :, 1] # show channel 1 which is Green
cv2.imshow("image", image2)
cv2.waitKey(0)
cv2.destroyAllWindows()
Manipulate channel
image: np.ndarray = cv2.imread("cow.jpg")
image2 = image.copy()
# channels : BGR => 0,1,2
# Here we want to show only Red channel
image2[:, :, 0] = 0
image2[:, :, 1] = 0
cv2.imshow("image", image2)
cv2.waitKey(0)
cv2.destroyAllWindows()