Originally Posted by alphamail
One question- how are you using the alpha channel layers for parallax?
I always break entire scene in separate assets (layers), determination of the asset boundaries I base on Paralaxing needs and decision what is going to be 2.5 or 3D projection and what is will be composited in Nuke or Shake.
2D asset that goes to comp, has a separate alpha channel file - a black and white version of color the layer. If 2.5 projection on Maya geometry, I have separate alpha channel file too.
To have alpha channel precise I create masks in my Photoshop, as I paint my layers so I can quickly use them when I need to create alpha channel. Otherwise I go to quick mask mode in Photoshop and paint my alpha channel.