python画像処理について

import requests
import io
from PIL import Image

url = 'https://cdn2.scratch.mit.edu/get_image/user/123019673_60x60.png'

#image = Image.open('sample.png')
image = Image.open(io.BytesIO(requests.get(url).content))
if image.mode != 'RGBA': image = image.convert('RGBA')
width, height = image.size

for y in range(height):
    for x in range(width):
        pixel_value = image.getpixel((x, y))
        print(f'({x}, {y}) : {pixel_value}')