Re: How to export out of AE a still frame or video while keeping the background transparent? by pxlguy on Aug 9, 2007 at 2:40:39 pm
One option is to do a Save Frame As... and use the Photoshop template. If there is no background in your composition, an alpha channel will be saved in the file. You should just make sure that your output template has RGB+ALPHA selected instead of just RGB.
I usually do a TIFF with Alpha, but that is not necessary.
Save Frame As... is located in the Composition Menu in the Menu Bar.