[Max Benz]

Im sorry to re-open this discussion, but i’ve been searching around in the forum (and after over 5 hours of try&fail) and could not find a single suggestion helpful in my case.

I’m working on a simple after effect composition, with CS5.5.0.253, where my white bg is progressively masked out to reveal trasparency for further editing in premiere pro.

Problem is, using the “loseless with alpha” or the png quicktime @32 bit, RGB+alpha, or the .tga sequence, I don’t get the trasparency in the final result.
The key fails in premiere pro and in the blackmagic video switcher that everyday plays my lw3rds created with the .tga sequence option in SD resolution, so i guess is an after effect problem.

Instead of the key, i keep having the background color set in the “compostion settings”. I should point out that i also see the trasparency grid while exporting.

I’ve already tried exporting with and without the OpenGL and the multiprocessing options.

Settings for the comp are HDTV 1080p 25 fps, square pixels.
I’m on a Win7 x64 SP1 on a Intel I7 3.2 GHz and 12 GB of RAM and a NVIDIA GeForce GTX 470.