make iOS app icon

make_app_icon.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# author ervin

import sys
from PIL import Image

for input_file_name in sys.argv[1:]:
    need_1x_image_size = [1024]
    need_2x_image_size = [20, 29, 40, 60]
    need_3x_image_size = [20, 29, 40, 60]
    src_image = Image.open(input_file_name)

    for size in need_1x_image_size:
        real_size = size * 1
        resize_image = src_image.resize((real_size, real_size), Image.ANTIALIAS)
        output_file_name = "AppIcon-%d@1x.png" % size
        resize_image.save(output_file_name, "png")

    for size in need_2x_image_size:
        real_size = size * 2
        resize_image = src_image.resize((real_size, real_size), Image.ANTIALIAS)
        output_file_name = "AppIcon-%d@2x.png" % size
        resize_image.save(output_file_name, "png")

    for size in need_3x_image_size:
        real_size = size * 3
        resize_image = src_image.resize((real_size, real_size), Image.ANTIALIAS)
        output_file_name = "AppIcon-%d@3x.png" % size
        resize_image.save(output_file_name, "png")

    print "done"