How to do it...

Perform the following steps:

1. Import all necessary modules, open the image, and output its shape:

import cv2, numpy as np
image = cv2.imread('../data/Lena.png').astype(np.float32) / 255
print('Shape:', image.shape)

2. Swap the red and blue channels and display the result:

image[:, :, [0, 2]] = image[:, :, [2, 0]]
cv2.imshow('blue_and_red_swapped', image)

cv2.waitKey()
cv2.destroyAllWindows()

3. Swap the channels back and scale them differently to change the colorization of the image:

image[:, :, [0, 2]] = image[:, :, [2, 0]]
image[:, :, 0] = (image[:, :, 0] * 0.9).clip(0, 1) 
image[:, :, 1] = (image[:, :, 1] * 1.1).clip(0, 1)
cv2.imshow('image', image)
cv2.waitKey()
cv2.destroyAllWindows()