code: def _get_image_format_mimetype(image_format: ImageFormat) -> str:
      """Get the mimetype string for the given ImageFormat."""
      return f"image/{image_format.lower()}"
  
imports: import base64
  import io
  import mimetypes
  import re
  from enum import IntEnum
  from typing import TYPE_CHECKING, List, Optional, Sequence, Union, cast
  from urllib.parse import urlparse
  import numpy
  from PIL import GifImagePlugin, Image, ImageFile
  from typing_extensions import Final, Literal, TypeAlias
  from streamlit import runtime
  from streamlit.errors import StreamlitAPIException
  from streamlit.logger import get_logger
  from streamlit.proto.Image_pb2 import ImageList
  from streamlit.runtime import caching
  from streamlit.runtime.metrics_util import gather_metrics
label_desc: Use image node_id 9 for calling a global function with example usage: _get_image_format_mimetype(image_format) and returns: str, image_format