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Inverted luma matte not working properly in render

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Nicola CoinInverted luma matte not working properly in render
by on Feb 8, 2012 at 3:43:52 am

Hello guys, I've always been a reader of creative cow and this is my first post, related to a problem I'm having on AE lately that's driving me literally mad.

The problem is related to an inverted luma matte and I have this situation: i created a comp consisting in some white smoke (different .mov files) spreading on a black background until it becomes fully white, and used this comp as a luma matte to make a picture dissolve (inverted luma matte)
I also used the same comp in the same way to dissolve the background later on.

Everything works as intended until I pre comp everything to use it with another comp or even when I try to render the work. what happens is this: the background dissolves (luma matte working) but the picture doesn't.
Like there's no matte at all, the picture just sits there.

I checked everything and I can't see why it shouldn't work only when I try to render or pre comp the work, also if the luma matte is wrong, why does it work on the background and not on the picture?

Please help, I need to solve this thing because it's for an important video and it's driving me mad.

Thanks in advance.

Nick


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Nicola CoinRe: Inverted luma matte not working properly in render
by on Feb 8, 2012 at 4:16:16 am

I've found out why: the picture had a layer style (drop shadow) and turning this off solves the problem, but then again I ask myself why? Is there a solution to make the whole thing work? (luma matte and drop shadow?)

thanks


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Tudor "Ted" JelescuRe: Inverted luma matte not working properly in render
by on Feb 8, 2012 at 8:06:03 am

Do not use Layer Styles, use the Drop Shadow effect. If that does not work, precomp and add drop shadow after.

Tudor "Ted" Jelescu
Senior VFX Artist


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Nicola CoinRe: Inverted luma matte not working properly in render
by on Feb 8, 2012 at 11:04:30 am

Thanks a lot. Any idea why layer styles mess up the matte though?

cheers


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Tudor "Ted" JelescuRe: Inverted luma matte not working properly in render
by on Feb 8, 2012 at 1:58:28 pm

Not really, I know that Layer Styles limits 3D interaction and gives error in a 3d environment, so I thought that may be the issue here as well. As to exactly why that happens... maybe Adobe can answer.

Todd...?

Tudor "Ted" Jelescu
Senior VFX Artist


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