Round down scale destination dimensions to nearest multiple of 8

    def upscale(self, img: PIL.Image, scale, selected_model: str = None):

        self.scale = scale

        dest_w = int(img.width * scale)

        dest_h = int(img.height * scale)

        dest_w = round((img.width * scale - 4) / 8) * 8

        dest_h = round((img.height * scale - 4) / 8) * 8

        for _ in range(3):

            shape = (img.width, img.height)