from typing import List


def img_tag(movie_id: int, frame: int, box: List[int]):
    """Get a 'standard' image tag as used by the face recognition stack.
    """
    # Real example of full file name: 121614:3616:235_183_293_262.jpeg
    # Face file names are <tag>.jpeg
    return f"{movie_id}:{frame}" + ":{}_{}_{}_{}".format(*box)