python: want to display red channel only in opencv

Question

I am beginner in image processing. I am showing image in many color space the below code show the image in the 3 channels R G B however the image displayed in the gray layou

Answer 1

import cv2
import numpy as np

channel_initials = list('BGR')

image = cv2.imread('download.jpg')

for channel_index in range(3):
    channel = np.zeros(shape=image.shape, dtype=np.uint8)
    channel[:,:,channel_index] = image[:,:,channel_index]
    cv2.imshow(f'{channel_initials[channel_index]}-RGB', channel)
cv2.waitKey(0)