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Urgent Help Needed....Alpha channel issue

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Urgent Help Needed....Alpha channel issue
by Chris Miller (5cou53r) on Jan 15, 2008 at 11:07:43 pm

First of all I need to apologise because I know this will probably be posted countless time but I have an important deadline tomorrow and am too stressed.

I have created a animated graphic in After Effects which I want to import into Avid xpress and drop over the footage. Each time I render and import it places a black background behind the graphic.

I need step by step instructions on how to set this graphic to export with a tranparent background into another program

Please Help!

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Re: Urgent Help Needed....Alpha channel issue
by Victor Nash on Jan 15, 2008 at 11:27:22 pm

Did you render out your file as Millions of Colors+ (RGB+Alpha)?

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Re: Urgent Help Needed....Alpha channel issue
by Chris Miller on Jan 15, 2008 at 11:36:42 pm

Yer I did I tried it with 'straight' output mode



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Re: Urgent Help Needed....Alpha channel issue
by Alejandro Torres on Jan 16, 2008 at 12:13:33 am

Hi!

What I usually do is export a jpg sequence with alpha channel activated, it will give you two sequences the original one and the alpha channel one, I don't use Avid but I am almost sure it can manage jpg sequences as video as well as permitting you to use the alpha channel sequence to be used as a matte, I don't use Avid but you could try this way.

Regards

Alejandro



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Re: Urgent Help Needed....Alpha channel issue
by Dave LaRonde on Jan 16, 2008 at 12:40:19 am

[Chris Miller] "Yer I did I tried it with 'straight' output mode"

What codec did you use? Just because you set it to straight and millions of colors+ doesn't always mean you're set.... especially if the codec doesn't support alpha channels.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV

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Re: Urgent Help Needed....Alpha channel issue
by Scott Cumbo on Jan 16, 2008 at 5:42:56 am

Make sure you have "invert alpha" selected on your import
setting on the avid end of things.

Scott Cumbo
Editor
Broadway Video, NYC

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Re: Urgent Help Needed....Alpha channel issue
by david bogie on Jan 16, 2008 at 8:29:20 pm

Yes to most of the above but give yourself some slack. The section in the AE manual on alphas is long and confusing. I imagine the one in the Avid manual is, too. Read them carefully. Probably twice.

bogiesan

This is my standard sigfile so do not take it personally: "For crying out loud, read the freakin' manual."

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Re: Urgent Help Needed....Alpha channel issue
by Aharon Rabinowitz on Jan 16, 2008 at 10:11:32 pm

This might help with understanding the whole alpha thing...

http://library.creativecow.net/articles/rabinowitz_aharon/straight_vs_premu...

Aharon Rabinowitz
Email: arabinowitz (AT) yahoo (DOT) com
All Bets Are Off Productions, Inc.
Creative Cow After Effect Podcast
Internet Killed the Video Star: A Guide to Creating Video for the Web

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