Quote Originally Posted by Marty Postma View Post
Yes A/B could solve some of the earlier mentioned transparency issues, but so could a Visual FX on a Layer as the crossfade would then be occuring on a single Layer as opposed to two.
Actually, this really wouldn't solve the transparency issues. Most of the problem comes from when you have two layers composited (via alpha or an effect) and you need to decrease the intensity of the image on the output for camera (too bright of a background, etc), and the top layer starts to become transparent and shows the layer behind it. I have run into this problem many times, and it is a very annoying problem.
Having a master intensity that does not effect opacity of the layers is really what is needed to solve this problem.