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I didn't test it. I don't have colour images on it. So, you can try this in below.

import cv2 

# Read Image1 
mountain = cv2.imread('green.jpg, 1) 

# Read image2 
dog = cv2.imread('yellow.jpg, 1) 

# Blending the images with 0.3 and 0.7 
img = cv2.addWeighted(mountain, 0.3, dog, 0.7, 0) 

# Show the image 
cv2.imshow('image', img) 

# Wait for a key 
cv2.waitKey(0) 

# Distroy all the window open 
cv2.distroyAllWindows()