title: How can I capture an Image for post processing in OSG
body: <p>I need to capture an Image from my viewer and need to do some post processing and display it back on it.
  Right now am more interested in the first part of it. That is to capture Image from the viewer.</p>
  
  <p>While going through the OSG I came across ScreenCaptureHandler.
  But am not able to get an Image out of it.</p>
  
  <p>I am still working to get it done but in case any of you have any other way of how it can be done or an Example for screencapturehandler that you can share. </p>