引入模块

from PIL import Image
import sys

定义函数

# 先将input image 填充为正方形
def fill_image(image):
    width, height = image.size
    # 选取原图片长、宽中较大值作为新图片的九宫格半径
    new_image_length = width if width > height else height
    # 生产新图片【白底】
    new_image = Image.new(image.mode, (new_image_length, new_image_length), color='white')
    # 将原图粘贴在新图上，位置为居中
    if width > height:
        new_image.paste(image, (0, int((new_image_length - height) / 2)))
    else:
        new_image.paste(image, (int((new_image_length - width) / 2), 0))
    return new_image

# 将图片切割成九宫格
def cut_image(image):
    width, height = image.size
    # 一行放3张图
    item_width = int(width / 3)
    box_list = []
    for i in range(0, 3):
        for j in range(0, 3):
            box = (j * item_width, i * item_width, (j + 1) * item_width, (i + 1) * item_width)
            box_list.append(box)
    image_list = [image.crop(box) for box in box_list]
    return image_list

# 保存图片
def save_images(image_list,save_path):
    index = 1
    for image in image_list:
        image.save(save_path+str(index) + '.png', 'PNG')
        index += 1

执行

if __name__ == '__main__':
    save_path = "D:\\Users\\Administrator\\Desktop\\test\\static\\images\\"
    file_path = "D:\\Users\\Administrator\\Desktop\\test\\static\\images\\bg.jpg"
    image = Image.open(file_path)
    # image.show()
    image = fill_image(image)
    image_list = cut_image(image)
    print(len(image_list))
    save_images(image_list,save_path)