title: Pyqt take screenshot of certain screen area
body: <p>I have this app written in pyqt. You can view the source at <a href="http://www.pasteall.org/62739/python" rel="nofollow">http://www.pasteall.org/62739/python</a> It takes screen shots of the desktop. what I want to know is how to make it also take a screen shot of a certain area on the screen like window's snipping tool can do (<a href="http://sjcblogs.sanjac.edu/its/files/2011/09/Snipping-Tool-selection-types1.jpg" rel="nofollow">http://sjcblogs.sanjac.edu/its/files/2011/09/Snipping-Tool-selection-types1.jpg</a> and gilsmethod.wpengine.netdna-cdn.com/images/snipping-tool-windows-73.png). How do I write this?</p>
  
  <p>Thank you in advance!</p>