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Getting a mask one layer to add alpha to another - mask tracking

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Brent GriffinGetting a mask one layer to add alpha to another - mask tracking
by on Apr 13, 2011 at 9:34:44 am

Hey,

I'm trying to motion track a solid layer with a mask on it to 'delete' part of a footage layer. I've followed every tutorial I can find, but they always fall short on what i'm looking for.

Till now I have animated masks on the layer I want to add alpha to, but as I want to motion track this alpha mask, I have read you should make it on a separate solid layer above the layer you want to delete from.

I have the mask on the solid motion tracked to the footage, but can't get it to 'delete' the relevant section.

If I 'add' from the mask layer, you just see the solid under the mask

If I then TrkMat to Alpha, the white disappears, but you just see the footage under the mask again

I'm going crazy, anyone help?

Thank you!


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Anders HattneRe: Getting a mask one layer to add alpha to another - mask tracking
by on Apr 13, 2011 at 9:53:49 am

Isn't it just a question of setting the track matte to Alpha Inverted?

http://www.ardillamedia.com


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Brent GriffinRe: Getting a mask one layer to add alpha to another - mask tracking
by on Apr 13, 2011 at 10:43:02 am

I wish. I've tried that, but it's not working, just reveals the white solid the mask is on. I popped a red solid under it all to show what it's doing.

I'm sure it's super simple, but it's just stumped me.



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Cassius MarquesRe: Getting a mask one layer to add alpha to another - mask tracking
by on Apr 13, 2011 at 2:09:32 pm

no bud, you set the bottom layer to use the above layer's matte... set your video to use alpha matte(not the solid)...and switch off the solid (eye icon).


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Brent GriffinRe: Getting a mask one layer to add alpha to another - mask tracking
by on Apr 13, 2011 at 7:12:18 pm

Man, thanks a million. I tried a tonne of different options, but of course, not that... Forest for the trees etc.

I've been trying to tighten up my fundementals of AE, and this is a reminder that now is the time, I should have had this on lock a long time ago.

Thanks again.


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