Pixelate an image without changing it's resolution!

image_pixelate.py

#!/usr/bin/env python3

import matplotlib.pyplot as plt
import numpy as np
import PIL
import PIL.Image as Image


plt.axis('off')

dname, iname, fmt = "/Users/Photos/", "avatar", "jpg"

img = Image.open(dname + iname + "." + fmt)
scl = 8

shape = np.array(img).shape

output = img.resize((shape[0]//scl, shape[1]//scl), resample=PIL.Image.LANCZOS)
output = output.resize(shape[:2], resample=PIL.Image.BOX)

plt.imshow(output)
plt.show()

output.save(dname + iname + "-pixelated.png")