Keying and rendering transparent background


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Keying and rendering transparent background
by Daniel Caza on Jun 30, 2009 at 6:41:36 pm

Hi

Im using After Effects CS3. I keyed out a green screen using keylight(1.2)and my rendered it as an .avi file with alpha+RGB selected for the channels option in the output settings.

But I have a solid black background in the finished product. I wanted to incorporate this clip into Premier Pro in a larger project but I cant now.

Thanks for any thoughts.

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Re: Keying and rendering transparent background
by Cuitla Huezo on Jun 30, 2009 at 7:30:18 pm

I'm a little new to this, but when I key and render a clip, it does show up with a "black background". That's actually the alpha channel being represented as black because there's nothing there behind it.

Have you actually placed the clip into the editing timeline and tested it? Remember that the keyed footage has to be above whatever the background is. So keyed footage should be on "Video 2" for example and the background on "Video 1".

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Re: Keying and rendering transparent background
by Daniel Caza on Jun 30, 2009 at 7:35:30 pm

Ya I brought it into Premier Pro CS3 and its got a big black box all around it. It was placed over another movie and the black did not disappear...

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Re: Keying and rendering transparent background
by Chris Buttacoli on Jun 30, 2009 at 8:40:26 pm

What codec did you use to render out RGB+alpha?

In the project bin, when you highlight the imported avi, does the information box at the top say RGB + alpha or something along those lines?

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Re: Keying and rendering transparent background
by Michael Szalapski on Jul 1, 2009 at 3:18:58 am

And in Premiere, did you set the clip's transparency to be based on the Alpha?

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