Download image from url, make polyline and convert it to base64

pillow.py

from base64 import b64encode
from PIL import Image, ImageDraw
import requests
from StringIO import StringIO

url = 'http://jssgallery.org/other_artists/andy_warhol/campbells.jpg'

response = requests.get(url)
img = Image.open(StringIO(response.content))
draw = ImageDraw.Draw(img)
draw.line([(449, 203), (447, 763), (208, 763), (215, 200), (449, 203)], fill=126, width=3)
output = StringIO()
img.save(output, 'PNG')
contents = output.getvalue()
print b64encode(contents)

img.save("img.png", "PNG")