[OpenCV] Python - Image read/write

import cv2
import numpy as np
import matplotlib.pyplot as plt

img_basic = cv2.imread('Lenna.png', cv2.IMREAD_COLOR)
cv2.imshow('Image Basic', img_basic)
cv2.waitKey()
cv2.imwrite('result1.png', img_basic)

img_gray = cv2.cvtColor(img_basic, cv2.COLOR_BGR2GRAY)
cv2.imshow('Image Gray', img_gray)
cv2.waitKey()
cv2.imwrite('result2.png', img_gray)
cv2.destroyAllWindows()