code: def _tiff_from_exif_segment(cls, stream, offset, segment_length):
          
          # wrap full segment in its own stream and feed to Tiff()
          stream.seek(offset+8)
          segment_bytes = stream.read(segment_length-8)
          substream = BytesIO(segment_bytes)
          return Tiff.from_stream(substream)
docs: Return a |Tiff| instance parsed from the Exif APP1 segment of
          *segment_length* at *offset* in *stream*.