def _crop_center(self, pil_img: TextIO, crop_width: int,
crop_height: int) -> TextIO:
img_width, img_height = pil_img.size
return pil_img.crop(
((img_width - crop_width) // 2, (img_height - crop_height) // 2,
(img_width + crop_width) // 2, (img_height + crop_height) // 2))
