#!/usr/bin/env python3 import numpy as np from PIL import Image import os directory = 'images/correctresolution/' i = 0 # Load image and convert to '1' mode #for filename in os.listdir(directory): for i in range(7777): f = os.path.join(directory, "thumb-" + str(i) + ".png") im = Image.open(f).convert('1') im.save("pbm/" + str(i) + ".pbm") i = i + 1