Hi All,
I thought I'd share this link that I found very informative. If you're anything like me and you approached this whole 3d thing without formal training you've likely missed this.
http://renderstuff.com/free-3d-tutorial-using-gamma-2.2.php
There’s often reference to gamma when rendering or compositing and I never quite “got it”. Well here’s an explanation.
hope it helps someone!