text: ## [imports]
  import cv2 as cv
  import sys
  ## [imports]
  ## [imread]
  img = cv.imread(cv.samples.findFile("starry_night.jpg"))
  ## [imread]
  ## [empty]
  if img is None:
      sys.exit("Could not read the image.")
  ## [empty]
  ## [imshow]
  cv.imshow("Display window", img)
  k = cv.waitKey(0)
  ## [imshow]
  ## [imsave]
  if k == ord("s"):
      cv.imwrite("starry_night.png", img)
  ## [imsave]
  