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tracking a green fluid

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Pino Arlacchi
tracking a green fluid
on Jun 19, 2012 at 12:33:29 pm

Hello.
what I'm trying to do, is to key out from a footage a flowing green fluid, substitute it with a white matte that have to stay on top, because it will have a very important glowing effect, so it must stay on top...
Until now, I started from Premiere Pro CS5.5 , substiture with two AE CS5.5 compositions.
In AE, i applied Red Giant Primatte Keyer to have :
1) in the first comp, the footage with the transparent placeholdr of the fluid
2) in the second comp, I did the same keying editing, but the "view" set on "matte", applied then the 'invert' effect thinking that in premiere the black would have been treated as transparent ...

I've tried for days, but what I got, is just what I could see in AE for the second comp, only the white matte running over a completely black background?
Where am I wrong?
How could I have only the matte in the second comp, with a transparent background?

I did tried, but I was not able to find how solve this...
thank you for your attention

Pino


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Dave LaRonde
Re: tracking a green fluid
on Jun 19, 2012 at 2:10:41 pm

I would do the entire shot in After Effects, including the glow.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Pino Arlacchi
Re: tracking a green fluid
on Jun 19, 2012 at 2:19:01 pm

Thank you Dave,
how could I edit only the green fluid?
could you point me to a tutorial ?

again, thanks


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Dave LaRonde
Re: tracking a green fluid
on Jun 19, 2012 at 2:48:09 pm

No tutorial necessary. Here's one way to do it:
  • Pull the chroma key. You now have transparency.
  • Nest this comp in a new comp, and use the Invert effect on the alpha channel. You now have a matte that moves as the green fluid moves.
  • Use the Fill effect to make this matte any color you want.
  • Use the Glow effect to make it glow.
  • Add the original footage as the bottom layer of the new comp. You now have a glow over the original footage.


Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Pino Arlacchi
Re: tracking a green fluid
on Jun 19, 2012 at 3:35:37 pm

Dave,
I will try it soon...
you're very kind, I'll keep you posted if you like...

thanks :)


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Pino Arlacchi
Re: tracking a green fluid
on Jun 19, 2012 at 6:26:21 pm

dear Dvae,
it works perfectly, just what I was looking for...
and I've learned a very important concept...

again, thank you, have a nice night...


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