How To Composite: G-Buffer Output Channels with photoshop?

[ness_andrew]

Hey there. I am trying to find information on how to composite layers inside photoshop correctly. I am finding it quite difficult and can't find any good tutorials. Even the help file in the vray help doesn't help me too much. I do understand that I need to use linear dodge when you add. Whenever I layer up each of the layers, it never 100% comes out as if I had rendered it in 1 layer. I am trying to separate out each light and each layer like specular, global ill, etc.
Thanks
Andrew Ness

[spot]

try this one:

http://www.onoff.ch/2006/04/11/channel-enforcer/