如何在一个文件夹中将白色图像背景颜色更改为黑色？

from PIL import Image
import os

def change_background_color(folder_path):
    for filename in os.listdir(folder_path):
        if filename.endswith(".jpg") or filename.endswith(".png"):
            image_path = os.path.join(folder_path, filename)
            image = Image.open(image_path)
            image = image.convert("RGBA")
            data = image.getdata()

            new_data = []
            for item in data:
                # 判断像素颜色是否接近白色
                if item[0] > 200 and item[1] > 200 and item[2] > 200:
                    new_data.append((0, 0, 0, 255))  # 更改为黑色
                else:
                    new_data.append(item)

            image.putdata(new_data)
            image.save(image_path)

# 调用函数并传入文件夹路径
change_background_color("folder_path")