code: def show(data, negate=False):
      
      from PIL import Image as pil
      data = np.array((data - data.min()) * 255.0 /
                      (data.max() - data.min()), np.uint8)
      if negate:
          data = 255 - data
      img = pil.fromarray(data)
      img.show()
docs: Show the stretched data.