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I can't remember what half of my Python scripts do or why I have them saved. Here's checksum-changer.py and I guess it is to shitpost banned 4chan images.

#!/usr/bin/env python3

import cv2

import os
import random
import sys
import time

if __name__ == "__main__":
    if len(sys.argv) < 2:
        print("Usage: {} image (n)".format(sys.argv[0]))
        sys.exit(1)
    fn = sys.argv[1]
    
    n = 1
    if len(sys.argv) > 2:
        n = int(sys.argv[2])
    
    dir = os.path.split(fn)[0]
    ext = os.path.splitext(fn)[-1]
    im_orig = cv2.imread(fn, cv2.IMREAD_UNCHANGED)
    for i in range(n):
        im = im_orig.copy()
        x = random.randint(0, im.shape[1]-1)
        y = random.randint(0, im.shape[0]-1)
        im[y, x] += 1
        
        name = f"{int(time.time()*1000+i)}{ext}"
        cv2.imwrite(os.path.join(dir, name), im)