Chromakey to Tiff Sequence

[escozooz]

I am building a composite from several characters filmed on a green screen.

I am magic bulleting the footage then using keylight for each character. To save render times I would like to export the keyed footage to a tiff sequence with an alpha channel embedded.

Then for the final composite I can just work with the backgrounds and the tiff sequences without re-rendering each sequence.

So ...

1) I magic bullet the footage. Then keylight the background out.
2) I export tiff-sequence, rgb+alpha, straight unmatted

But the tiff sequence comes in with some of the background still showing. I know I'm doing something wrong because the footage looks great in AE in the comp window but when I export to tiff then back in, part of the background is still visible.

I open my tiffs in PS and there is no alpha channel either.

Any suggestions would be appreciated.

Comp after MagicBullet and Keylight (http://www.mattworkman.com/dvxuser/01.jpg)

Comp Export Settings (http://www.mattworkman.com/dvxuser/02.jpg)

Sequence imported (no alpha and bg still showing) (http://www.mattworkman.com/dvxuser/03.jpg)

[HagerNYC]

Hi Escozooz,
I don't think you should Magic Bullet your imported green screen footage before keying out the screen. You should only do prep work to the shot before keying like adjust the green saturation, brightness & contrast, but that’s it. You want to keep the keying process as clean as possible. Once you're keyed out, then add Magic Bullet. You might as well also add the background image as well. The less rendering process your footage goes through the less the pixels degenerate. Green screen composites are hard enough as it is in DV res. I'm working on a sci-fi project right now involving green screen on the DVX compisiting actors into 3D environments from Maya. I import the footage, clean it up for keying (lightly) then go to work color correcting and compositing the background/foreground elements.
Hope this helps.
Something else you should look at is getting Echo fire from Synthetic Aperture. It allows TV monitor preview just like Premier. :)