如何使用PIL将文件夹中的多个图像裁剪成圆形？

from PIL import Image
import os

def crop_to_circle(image_path, save_path):
    # 打开图像
    image = Image.open(image_path)
    
    # 创建一个与图像相同大小的透明背景图像
    mask = Image.new("L", image.size, 0)
    
    # 创建一个画笔
    draw = ImageDraw.Draw(mask)
    
    # 在透明背景上画一个圆形
    draw.ellipse((0, 0, image.size[0], image.size[1]), fill=255)
    
    # 将透明背景应用到原始图像上
    image.putalpha(mask)
    
    # 保存裁剪后的图像
    image.save(save_path)

def crop_images_in_folder(folder_path):
    # 获取文件夹中的所有图像文件
    image_files = [f for f in os.listdir(folder_path) if os.path.isfile(os.path.join(folder_path, f))]
    
    # 遍历图像文件并进行裁剪
    for image_file in image_files:
        # 构建图像文件的完整路径
        image_path = os.path.join(folder_path, image_file)
        
        # 构建保存裁剪后图像的路径
        save_path = os.path.join(folder_path, "cropped_" + image_file)
        
        # 调用裁剪函数进行裁剪
        crop_to_circle(image_path, save_path)

folder_path = "your_folder_path"
crop_images_in_folder(folder_path)