Today I wanted to make an effect using the Z-Channel. Since there is not 3d objects in that scene, I create some rotoshape. Then I wanted to assign a Z-Channel to one of them. I suned them technique as in the tutorial. (Shape(BW) -> invert -> reoder (rgbar) ) After that I don't see a Z channel in the next node (Mult node to change the depth).
I have done exactly the same thing in another scene.
The difference is that the new one is in HDTV preset, while the other was in normal PAL.
Has anybody is that effect ? Or is it a Bug ?