get pixel values of image with open cv using mouse and with this two values normalize the image

def get_colour():
    img = cv2.imread(image_path)
    cv2.namedWindow('image')

    def pick_colour(event, x, y, flags, param):
        if event == cv2.EVENT_LBUTTONDBLCLK:
            pixel = img[y, x]
            print("Red: ", pixel[0])
            print("Green: ", pixel[1])
            print("Blue: ", pixel[2])
            print("---------")
            color = pixel
            color = color.astype("float") / 255
            return color

    cv2.setMouseCallback('image', pick_colour)

    while True:
        cv2.imshow("image", img)
        if cv2.waitKey(20) & 0xFF == 27:
            break

    cv2.destroyAllWindows()