code: def _get_thumbnail_image_from_file(dir_path, image_file):
      
      # Get image
      img = _get_image_from_file(dir_path, image_file)
      # If it's not supported, exit now
      if img is None:
          return None
      if img.format.lower() == 'gif':
          return None
      # Get image dimensions
      img_width, img_height = img.size
      # We need to perform a resize - first, work out the scale ratio to take the
      # image width to THUMBNAIL_WIDTH (THUMBNAIL_WIDTH:img_width ratio)
      scale_ratio = THUMBNAIL_WIDTH / float(img_width)
      # Work out target image height based on the scale ratio
      target_height = int(scale_ratio * img_height)
      # Perform the resize
      try:
          img.thumbnail((THUMBNAIL_WIDTH, target_height), resample=RESAMPLE)
      except IOError as exptn:
          print('WARNING: IOError when thumbnailing %s/%s: %s' % (
              dir_path, image_file, exptn
          ))
          return None
      # Return the resized image
      return img
docs: Get a PIL.Image from the given image file which has been scaled down to
      THUMBNAIL_WIDTH wide.
      @param {String} dir_path - The directory containing the image file
      @param {String} image_file - The filename of the image file within dir_path
      @return {PIL.Image} An instance of the thumbnail as a PIL Image, or None
          if the functionality is not available. See _get_image_from_file for
          details.