Python: Methods of copying a mask indicated region of one image into another

copy_image_using_mask.py

#Method 1, pythonic
        img_res = np.zeros(image.shape, np.uint8)   #create the image
        img_res[:, :] = (0, 0, 200)                 #color it red
        idx = (mask != 0)
        img_res[idx] = image[idx]
        
#Method 2 OpenCV
        img_red = np.zeros(image.shape, np.uint8)                 #create the image
        img_red[:, :] = (0, 0, 200)                               #color it red
        fg = cv2.bitwise_and(image, image, mask=mask)             #isolate the segmented region
        bg = cv2.bitwise_and(img_red, img_red, mask=(255 - mask)) #create the inverse segmented image
        img_res = fg + bg                                         #combine