title: python PIL image.open() error
body: <p>hello i'm using PIL to open images but there are such errors like this; 
  Traceback (most recent call last):</p>
  
  <pre><code>  File "/Users/minsw0810gmail.com/Desktop/GUIAccidentAlarm.py", line 
  142, in &lt;module&gt;
     filename1 = Image.open('횡단보도상_100x100.jpg', "rb")
    File 
  "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-
  packages/PIL/Image.py", line 2462, in open
      raise ValueError("bad mode %r" % mode)
  ValueError: bad mode 'rb'
  [Finished in 0.8s with exit code 1]
  [shell_cmd: python -u 
  "/Users/minsw0810gmail.com/Desktop/GUIAccidentAlarm.py"]
  [dir: /Users/minsw0810gmail.com/Desktop]
  [path: /usr/bin:/bin:/usr/sbin:/sbin]
  </code></pre>
  
  <p>*횡단보도상_100x100.jpg is korean
  and my code is </p>
  
  <p>filename1 = Image.open('횡단보도상_100x100.jpg')</p>