.

import os
from PIL import Image

path = 'E:\\폴더\\'  # 원본 폴더
resultPath = 'E:\\폴더'  # 결과 폴더(새로 저장할)

# if not os.path.exists(resultPath):
#     os.mkdir(resultPath)

list = os.listdir(path)
list.sort()

for filename in list:
    file = path + filename
    img = Image.open(file)
    img.save(os.path.join(resultPath, filename), 'JPEG', qualty=50)  # 품질 55로 줄이면서 용량 ↓