code: def make_blob(self, store=current_store):
          
          with self.open_file(store) as f:
              return f.read()
docs: Gets the byte string of the image from the ``store``.
  
          :param store: the storage which contains the image.
                        :data:`~sqlalchemy_imageattach.context.current_store`
                        by default
          :type store: :class:`~sqlalchemy_imageattach.store.Store`
          :returns: the binary data of the image
          :rtype: :class:`str`