def _increase(self, resource):
        """
        Increase image size
        :param resource: Image
        :return: Image
        """
        original_width, original_height = resource.size

        target_width = original_width + self.value
        target_height = original_height + self.value

        resource = resource.resize((target_width, target_height), Image.ANTIALIAS)

        return resource