Andrew Weidenhammer takes a great look at the entire workflow process when using V-Ray for Maya, including methodology for post-processing renders. Great stuff!
“This video goes over a workflow methodology for post-processing your renders. This is not a walkthrough of building a scene for rendering, but instead, how we set up output for further tweaks in post. The models in this video can be found at http://www.digitalxmodels.com/ Many thanks to them for providing a nice selection of free models. It would be against the agreement to redistribute the models, so I can’t give people the scene, but the setup is pretty well covered in this video, and you can grab the models files there.”