Role of Alpha Channels in After Effects


show more Understanding the alpha channels provides you with in-depth training on Video. Taught by Ian Robinson as part of the After Effects CS6 Essential Training show less
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Understanding the alpha channels

When you render graphics with transparency, you'll probably want to render the graphic with an Alpha channel. Now in the previous video, we did just that. We rendered a QuickTime that had an Alpha channel. So to see what that Alpha channel looks like, let's just select the Mill Pre Comp video that we see up here in our Project panel and drag it down to its own composition in the bottom of the Project panel. Now double-click the Mill Pre Comp 2 just in case it's not open on your system. And here you can see we have just the QuickTime and only the QuickTime.

If I turn the Visibility off, you can see. That's it. In the comp window here at the bottom, you can see I have this three-circle button. If I click on that, notice I can choose what channel I'd like to see, Red, Green, Blue, or Alpha. If I choose the Alpha channel, this will show me whatever is transparent. So whatever is white will allow the graphic to be seen and whatever is black will be transparent. If we select the...

Understanding the alpha channels
Video duration: 5m 18s 8h 41m Beginner

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Understanding the alpha channels provides you with in-depth training on Video. Taught by Ian Robinson as part of the After Effects CS6 Essential Training

Subject:
Video
Software:
After Effects
Author:
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