code: def open_file(self, store=current_store, use_seek=False):
          
          original = self.require_original()
          return original.open_file(store, use_seek)
docs: The shorthand of :meth:`~Image.open_file()` for
          the :attr:`original`.
  
          :param store: the storage which contains the image files
                        :data:`~sqlalchemy_imageattach.context.current_store`
                        by default
          :type store: :class:`~sqlalchemy_imageattach.store.Store`
          :param use_seek: whether the file should seekable.
                           if :const:`True` it maybe buffered in the memory.
                           default is :const:`False`
          :type use_seek: :class:`bool`
          :returns: the file-like object of the image, which is a context
                    manager (plus, also seekable only if ``use_seek``
                    is :const:`True`)
          :rtype: :class:`file`,
                  :class:`~sqlalchemy_imageattach.file.FileProxy`,
                  file-like object