pixelize.py

from PIL import Image
from sys import argv


def pixelate(inpt, outpt, colors, k):
    img = Image.open(inpt).convert('P', palette=Image.ADAPTIVE, colors=colors)
    w, h = img.size
    img = img.resize((285, 385)).resize((w, h), Image.NEAREST)
    img.quantize(colors=colors, kmeans=k)
    img.save(outpt)


if __name__ == '__main__':
    pixelate(argv[1], argv[2], int(argv[3]), int(argv[4]))