x

gistfile1.txt

for i in range(0, int(largeur/2.)):
    for j in range(0, int(hauteur/2.)):
        # coordonnées du coin haut gauche
        # pour chaque groupe de 4 pixels
        
        coin_x = i*2
        coin_y = j*2
        print(coin_x, coin_y)
        
        p0 = image[coin_y][coin_x]
        p1 = image[coin_y][coin_x+1]
        p2 = image[coin_y+1][coin_x]
        p3 = image[coin_y+1][coin_x+1]