def display(self, image):
        """
        Takes a :py:mod:`PIL.Image` and makes a copy of it for later
        use/inspection.

        :param image: Image to display.
        :type image: PIL.Image.Image
        """
        assert(image.size == self.size)

        self.image = self.preprocess(image).copy()
Takes a :py:mod:`PIL.Image` and makes a copy of it for later
        use/inspection.

        :param image: Image to display.
        :type image: PIL.Image.Image