Python PIL NameError global name Image is not defined

I installed PIL 1.1.7 using the executable for Python 2.7. But when I run this code :

import requests
from PIL import *

def main() :
    target = "http://target/image.php" #returns binary data for a PNG.
    cookies = {"mycookie1", "mycookie2"}
    r = requests.get(target, cookies=cookies)
    im = Image.open(r.content) #r.content contains binary data for the PNG.
    print im

if __name__ == "__main__" :
    main()

It gives the error :

Traceback (most recent call last):
File "D:\Programming\Python\code\eg_cc1.py", line 17, in <module>
  main()
File "D:\Programming\Python\code\eg_cc1.py", line 13, in main
  im = Image.open(r.content)
NameError: global name 'Image' is not defined

I installed PIL in Lib\site-packages.