Resize images and convert to progressive JPG with pillow

resize-images.py

from os import listdir
from os.path import isfile, join
from PIL import Image

mypath = '.'
onlyfiles = [f for f in listdir(mypath) if isfile(join(mypath, f)) and '.jpg' in f]

MAX_DIM = 800

for path in onlyfiles:
    print(path)

    image = Image.open(path)
    (width, height) = image.size

    # Resize
    factor = min(MAX_DIM / height, MAX_DIM / width)
    if factor < 0.95:
        size = (int(width * factor), int(height * factor))
        image = image.resize(size, Image.ANTIALIAS)

    image.save(path, 'JPEG', quality=90, optimize=True, progressive=True)