code: def getDimensionForImage(filename, maxsize):
      
      try:
          from PIL import Image
      except ImportError:
          return None
      img = Image.open(filename)
      width, height = img.size
      if width > maxsize[0] or height > maxsize[1]:
          img.thumbnail(maxsize)
          out.info("Downscaled display size from %s to %s" % ((width, height), img.size))
      return img.size
docs: Return scaled image size in (width, height) format.
      The scaling preserves the aspect ratio.
      If PIL is not found returns None.