TroikaTronix Forum: Isadora: General: Matte and Alpha Channels


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Matte and Alpha Channels

gavspav
User

Mar 12, 2008, 8:49 AM

Post #1 of 2 (687 views)
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Matte and Alpha Channels	Can't Post

Apologies if I've asked this before.......

I'm using the Matte actor to add one video stream to another.
Is there a way of using alpha channels with my destination image?

I have a background(source) video playing into the background input of the Matte actor.
I run my destination clip though the Alpha Mask actor and into the foreground input of the Matte actor.

But the resultant image has a black border around the non-masked area. It is rectangular.
Is there a way round this. Can I add an oval section of the video to the background using the Matte actor?

Apologies if gibberish isn't your first language!

Gavin

Mark Coniglio
TroikaTronix / Moderator

Mar 26, 2008, 12:33 PM

Post #2 of 2 (615 views)
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Re: [gavspav] Matte and Alpha Channels [In reply to]	Can't Post

Dear Gavin,

Unfortunately the Matte actor will not respect the alpha mask when combining the two images. It's using a rather old QuickTime call to do the processing, and the alpha portion of the image gets trashed.

Sorry...

Best,
Mark

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Mark Coniglio / TroikaTronix
Creator of Isadora

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