from PIL import Image


def change_brightness(img: Image, level: float) -> Image:
 """
 Change the brightness of a PIL Image to a given level.
 """

 def brightness(c: int) -> float:
 """
 Fundamental Transformation/Operation that'll be performed on
 every bit.
 """
 return 128 + level + (c - 128)

 if not -255.0 <= level <= 255.0:
 raise ValueError("level must be between -255.0 (black) and 255.0 (white)")
 return img.point(brightness)


if __name__ == "__main__":
 # Load image
 with Image.open("image_data/lena.jpg") as img:
 # Change brightness to 100
 brigt_img = change_brightness(img, 100)
 brigt_img.save("image_data/lena_brightness.png", format="png")