PIL 一秒切九图 朋友圈发图神器

注意图片像素返回值是（宽度，高度），pil填像素点坐标原点左上角。

判断像素点是否在圆方程中。

import numpy as np
from PIL import Image

file = input()
im = Image.open(file)
R,C = im.size
newR = R//3
newC = C//3

picls = []
for i in range(9):
    picls.append(Image.new('RGB', (newR, newC),(255,255,255)))

cnt = 0
for i in range(3):
    for j in range(3):
        for x in range(i * newC, (i + 1) * newC):
            for y in range(j*newR,(j+1)*newR):
                if 4*C*C*(y-R//2)*(y-R//2) + 4*R*R*(x - C//2)*(x - C//2) <= R*R*C*C:
                    r, g, b = im.getpixel((y, x))
                else :
                    r, g, b = 255,255,255
                picls[cnt].putpixel((y-(j*newR),x-i*newC),(r,g,b))
        cnt+=1

for i in range(9):
    picls[i].save("".join(str(i))+".jpg")