这段代码通过urllib2打开远程图片，通过cStringIO读取文件内容，不用保存到磁盘即可读取图片文件的信息

#!/usr/bin/env python
#encoding=utf-8
 
import cStringIO, urllib2, Image
 
url = 'http://www.01happy.com/wp-content/uploads/2012/09/bg.png'
file = urllib2.urlopen(url)
tmpIm = cStringIO.StringIO(file.read())
im = Image.open(tmpIm)
 
print im.format, im.size, im.mode