docs: def read_mm_header(fh, byteorder, dtype, count, offsetsize):
      """Read FluoView mm_header tag from file and return as dict."""
      mmh = fh.read_record(TIFF.MM_HEADER, byteorder=byteorder)
      mmh = recarray2dict(mmh)
      mmh['Dimensions'] = [
          (bytes2str(d[0]).strip(), d[1], d[2], d[3], bytes2str(d[4]).strip())
          for d in mmh['Dimensions']]
      d = mmh['GrayChannel']
      mmh['GrayChannel'] = (
          bytes2str(d[0]).strip(), d[1], d[2], d[3], bytes2str(d[4]).strip())
      return mmh