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

You can just make a copy of the original image and set some channels to 0.

import cv2

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

b = image.copy()
# set green and red channels to 0
b[:, :, 1] = 0
b[:, :, 2] = 0


g = image.copy()
# set blue and red channels to 0
g[:, :, 0] = 0
g[:, :, 2] = 0

r = image.copy()
# set blue and green channels to 0
r[:, :, 0] = 0
r[:, :, 1] = 0


# RGB - Blue
cv2.imshow('B-RGB', b)

# RGB - Green
cv2.imshow('G-RGB', g)

# RGB - Red
cv2.imshow('R-RGB', r)

cv2.waitKey(0)