title: Adjusting the colour/contrast/gamma etc of the video source
body: <p>I would like to know whether a Google TV device could be used as a 'man in the middle' and make manual adjustments to the colour and gamma of the input source from HDMI in, before output to the TV?</p>
  
  <p>There are several apps already for phones/tablets which allow for these adjustments but I'm unsure what (if any) control over the video signal can be acheived with a GTV device.</p>
  
  <p>Any insight into the feesibility of such an application would be most appreciated.</p>