python缩放图片再居中剪切

import io, requests
from PIL import Image

url = 'https://cdn.tatlerasia.com/asiatatler/i/hk/2018/11/05194216-hennessey-venom-f5-15_cover_1600x1000.jpg'
res = requests.get(url)

img = Image.open(io.BytesIO(res.content))

def imageCut(img:Image, flag='center'):
    '''居中剪切成正方形图片'''
    # 计算剪切图片的坐标点，左上角和右下角坐标
    (w, h) = img.size
    if w > h:
        opt = ((w-h)/2,0,(w-h)/2+h,h)
    else:
        opt = (0, (h-w)/2,w,(h-w)/2+w)
    return img.crop(opt)

img = imageCut(img)

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