Download, resize image without ruining aspect ration. OSX specific

crop_resize_osx_hack.py

#!/usr/bin/env python
"""
Quick hack to download an image, then resize to a smaller image
that does not ruin the aspect ratio of the original image.

NOTE: The script is OS X specific: uses commands 'sips' and 'file'.
"""
import sys
import commands #deprecated in Python 3 - use 'subprocess' module

BASE_IMAGE_URL = "http://example.com/%s"

def get_width_height(image_name):
    widthstr = commands.getstatusoutput("sips -g pixelWidth %s " % image_name)[1]
    heightstr = commands.getstatusoutput("sips -g pixelHeight %s " % image_name)[1]
    width = int(widthstr.split("pixelWidth: ")[1])
    height = int(heightstr.split("pixelHeight: ")[1])
    return [width, height]

def crop_to_min(image_name, width, height):
    cropto = height
    if width <= height: cropto = width
    cmd = "sips --cropToHeightWidth %d %d %s" % (cropto, cropto, image_name)
    print "Running: %s ..." % cmd
    result = commands.getstatusoutput(cmd)
    return result

def crop_resize_square(image_name, size=200):
    width, height = get_width_height(image_name)
    result0 = crop_to_min(image_name, width, height)
    cmd = "sips --resampleHeightWidth %d %d %s" % (size, size, image_name)
    result1 = commands.getstatusoutput(cmd)
    result2 = commands.getstatusoutput("du -h %s " % image_name)[1]
    return result2

def get_image_for_url(imagepath):
    url = BASE_IMAGE_URL % imagepath
    print "getting: %s " % url
    real_image_url = "http://" + commands.getstatusoutput("curl %s " % (url, ))[1].split("http://")[1]
    print real_image_url
    result1 = commands.getstatusoutput("curl %s > %s.tempfile" % (real_image_url, imagepath))
    filetype = commands.getstatusoutput("file %s.tempfile" % imagepath)[1]
    if "JPEG" in filetype: ext = ".jpg"
    if "PNG" in filetype: ext = ".png"
    filename = imagepath.lower() + ext
    result1 = commands.getstatusoutput("mv %s.tempfile %s" % (imagepath, filename))
    return filename
    

if __name__ == "__main__":
    imagepath = sys.argv[1]
    image_name = get_image_for_url(imagepath) 
    print "Result: ", crop_resize_square(image_name)