Automatically resize screenshots for the App Store for each screen in Python

sudo easy_install pillow

#  -*- encoding: utf-8 -*-
from PIL import Image

#File before resizing(4.Assuming a 7-inch size image)
fileNames = ['01.png','02.png','03.png','04.png','05.png']

#Information on each screen resolution
resolutions = [[5.5,1242,2208], [4.7,750,1334], [4.0,640,1136], [3.5,640,960]]

for i in range(5):
    for j in range(4):
    	if j == 0:
            # 5.For 5 inches, use resize to enlarge
			image = Image.open(fileNames[i], 'r')
			resize_image = image.resize((resolutions[j][1], resolutions[j][2]))
			resize_image.save('screenshot_' + str(resolutions[j][0]) + '_0' + str(i+1) +'.jpg', 'JPEG', quality=100, optimize=True)
    	else:
            # 4.7 inches or less is less deteriorated when using thumbnail
			image = Image.open(fileNames[i], 'r')
			canvas = Image.new('RGB', (resolutions[j][1], resolutions[j][2]), (255, 255, 255))
			image.thumbnail((resolutions[j][1], resolutions[j][2]), Image.ANTIALIAS)
			x = (resolutions[j][1] - image.size[0])/2
			canvas.paste(image, ( x, 0))
			canvas.save('screenshot_' + str(resolutions[j][0]) + '_0' + str(i+1) +'.jpg', 'JPEG', quality=100, optimize=True)

python resize.py

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