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Alpha - inserting new footage behind presenter

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Chris Pulleyn
Alpha - inserting new footage behind presenter
on Sep 20, 2009 at 11:32:09 pm

Hi All
I have recieved a .mov, of a presenter moving and talking, green-keyed. He is now on white apparently with an alpha including him and his shadow.

My question is; how do get the presenter's layer to support passing other footage behind him. I have tried various layer mode changes and obvious Alpha commades but keep loosing his density/transparency or luminosity. If I re-key the white I loose most of him and his shirt!

Using: AE-CS3 on pc. Editing with Edius Pro 4

I have looked all over and everyone explains keying but not alpha manipulation


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Laurie Turner
Re: Alpha - inserting new footage behind presenter
on Sep 21, 2009 at 1:19:02 pm

I am a little confused. Are you saying you have him keyed but with a white background in one .mov file? You don't have him on a seperate layer and the white background on the another layer? If that's the case then all you can really do is roto scope him out. You can try to create a matte like andrew kramer's sky replacement video on videocopilot.net


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Chris Pulleyn
Re: Alpha - inserting new footage behind presenter
on Sep 21, 2009 at 3:14:17 pm

Thanks Dave & Laurie,
I have done alot more reading since the post and came to the conclusion i was in trouble.

I didn't want to go back to the producer with a silly question like "did that footage NOT have an Alpha?" but I got an updated version this morning and this one worked straight away.... so it seems that it wasn't there.

BTW Can I fine tune the Alpha though or is it WYSIWYG?
There is still a bit of a white shimmer around him.
It is a low level web-edit but as I'm at it I'd like to get it as right as i can.


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