cut_circle.py

#! /bin/python
import os, math
import Image
import ImageDraw

def cut_circle(source, target):
    image = Image.open(source).convert("RGBA")
    size = image.size
    r2 = min(size[0], size[1])
    if size[0] != size[1]:
        image = image.resize((r2, r2), Image.ANTIALIAS)
    circle = Image.new('L', (r2, r2), 0)
    draw = ImageDraw.Draw(circle)
    draw.ellipse((0, 0, r2, r2), fill=255)
    alpha = Image.new('L', (r2, r2), 255)
    alpha.paste(circle, (0, 0))
    image.putalpha(alpha)
    image.save(target)

if __name__ == "__main__":
    cut_circle("origin-logo.png", "logo.png")
    print("cut finished.")