How would I do a key with separate alpha channel?

[Chris Borjis]

looks like you would use something like a “track matte” setting.

[Walter Soyka]

The second half of that movie is meant to be used as a luma track matte on the object you wish to reveal. Your stacking order would look like this:

V3 Second half of animation (grayscale matte)
V2 Object you wish to reveal
V1 First half of animation (color)

Align the end of the matte clip on V3 with the end of the matte clip on V1. Add the “Track Matte Key” effect to the clip on V2, then set its matte to Video 3, Composite Using to Matte Luma, and check the reverse box.

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog – What I’m thinking when my workstation’s thinking
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[Ann Bens]

I am guessing.
V1 first half of red box
V2 object
V3 second half of box with Track Matte effect set to V4 and Matte Alpha
V4 mask.

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[Bill Thomas]

Hi all,

I tried both of these and neither one does it!

Maybe I should have mentioned that I’m still on CS5? Although I would think a matte is a matte, right?

Any other ideas?

Thanks again!