code: def transform(images, out_dir, fname):
          
          from PIL import Image as PILImage
          base = os.path.join(out_dir, "media", "images")
          width, height = images[0].image.size
          num_images_to_log = len(images)
  
          if num_images_to_log > Image.MAX_IMAGES:
              logging.warn(
                  "The maximum number of images to store per step is %i." % Image.MAX_IMAGES)
              num_images_to_log = Image.MAX_IMAGES
  
          if width * num_images_to_log > Image.MAX_DIMENSION:
              max_images_by_dimension = Image.MAX_DIMENSION // width
              logging.warn("The maximum total width for all images in a collection is 65500, or {} images, each with a width of {} pixels. Only logging the first {} images.".format(max_images_by_dimension, width, max_images_by_dimension))
              num_images_to_log = max_images_by_dimension
  
          total_width = width * num_images_to_log
          sprite = PILImage.new(
              mode='RGB',
              size=(total_width, height),
              color=(0, 0, 0))
          for i, image in enumerate(images[:num_images_to_log]):
              location = width * i
              sprite.paste(image.image, (location, 0))
          util.mkdir_exists_ok(base)
          sprite.save(os.path.join(base, fname), transparency=0)
          meta = {"width": width, "height": height,
                  "count": num_images_to_log, "_type": "images"}
          # TODO: hacky way to enable image grouping for now
          grouping = images[0].grouping
          if grouping:
              meta["grouping"] = grouping
          captions = Image.captions(images[:num_images_to_log])
          if captions:
              meta["captions"] = captions
          return meta
docs: Combines a list of images into a single sprite returning meta information