from PIL import Image

if __name__ == "__main__":
    image = Image.open("你的图片.xxx")
    image = image.convert("RGBA")
    w, h = image.size

    for x in range(0, w):
        for y in range(0, h):
            r, g, b, a = image.getpixel((x, y))
            if r >= 250 and g >= 250 and b >= 250:
                a = 0
                image.putpixel((x, y), (r, g, b, a))
            else:
                image.putpixel((x, y), (224,229, 232, a))

    image.save("output.png")