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1. Re: AME and After Effects
Tim Kurkoski Sep 4, 2012 11:46 AM (in response to Jack Banatoni)Jack,
To set whether or not AME encodes an alpha channel, you need to set the bit depth appropriately. See the first part of my response here for how to navigate the difference in terminology:
http://forums.adobe.com/message/4652418#4652418
AME encodes alpha channels in QuickTime only as straight, there is no control over premul vs. straight. That's a limitation in AME, it just doesn't have that level of control. (There's a further complication that when After Effects feeds the comp to AME, it does not provide the comp background color as part of the composite. So even if there was a premul option, AME would premul only against black.)
Please submit a feature request for AME if you'd like to see this changed:
If alpha channel control is an important part of your workflow then you may want to investigate Lloyd Alvarez's Background Renderer script, which will allow you to render your AE comps using a background instance of AE (instead of AME) while you keep working:


