imgCompare.py

# The following script gets 2 folders as input and
# compares the images with each other. Possible 
# differences are stored in a new folder starting 
# with compresult_
# usage: python imgCompare.py -f folder1 -s folder2

import argparse
import os
from datetime import datetime
from PIL import Image, ImageChops

parser = argparse.ArgumentParser()
parser.add_argument("--first",  "-f", help="path to the first folder for image comparison", required=True)
parser.add_argument("--second", "-s", help="path to the second folder for image comparison", required=True)
args = parser.parse_args()

dir1 = args.first
dir2 = args.second

outputdir = "compresult_" + datetime.now().strftime("%Y%m%d_%H%M%S")

for filename in os.listdir(dir1):
    file1 = os.path.join(dir1, filename)
    file2 = os.path.join(dir2, filename)

    if not os.path.exists(file2):
        print("File " + file2 + " does not exist in second folder. Skip image")
        continue

    im1 = Image.open(file1)
    im2 = Image.open(file2)

    print("Compare " + filename + " (" + file1 + " AND " + file2 + ")")

    diff_img = ImageChops.difference(im1, im2).convert("RGB")
    if diff_img.getbbox():
        outpath = outputdir + "/" + filename + "-s.png"
        print("  Images are different, store difference in " + outpath)
        os.makedirs(outputdir , exist_ok=True)
        diff_img.save(outpath)
    else:
        print("  Images are equal")