import cv2

img = cv2.imread("koala.jpg")
gray_img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
bgr_img = cv2.cvtColor(img, cv2.COLOR_RGB2BGR)
cv2.imshow("Koala:gray", gray_img)
cv2.imshow("Koala:bgr", bgr_img)
cv2.waitKey(0)
cv2.destroyAllWindows()