make_image_square.py

from PIL import Image
import os
import argparse

if __name__ == "__main__":
    parser = argparse.ArgumentParser(
        description='Make biggest centered square of images in given directory')
    parser.add_argument('--dir',
                        help='Project directory for search image files',
                        required=True)
    parser.add_argument('--out',
                        help="output folder name for squared images",
                        required=True)

    args = parser.parse_args()
    try:
        os.mkdir(args.out)
    except OSError as oserr:
        # already exists
        if oserr.errno == 17:
            pass
        else:
            raise oserr
    for root, subdirs, files in os.walk(args.dir):
        for filename in files:
            img = Image.open(open(os.path.join(root, filename)))
            width, height = img.size
            if width > height:
                delta = width - height
                left = int(delta / 2)
                upper = 0
                right = height + left
                lower = height
            else:
                delta = height - width
                left = 0
                upper = int(delta / 2)
                right = width
                lower = width + upper
            img = img.crop((left, upper, right, lower))
            img.save(
                os.path.join(args.out, filename.replace(".", "_squared.")))