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Grey outline Alpha Inverted Trackmatte

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Bernhard Walzl
Grey outline Alpha Inverted Trackmatte
on Oct 28, 2015 at 8:17:30 pm

Hi,

I need to create a black video with transparent text. So only the characters from the text are transparent so the underneath video can bleed through the letters.

For this I have an illustrator file with transparent background and white text.
I import this file into after effects. I use this file to Trackmatte option to cut through.

However, when I use a black background I can see a grey outline of the text.

It looks like the track matte uses only the 100% white to cut through, the grey outline of the text remains white.

here an example :




Whats wrong here? how can i make the r and e disappear and only the white c remains visible?


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Dave LaRonde
Re: Grey outline Alpha Inverted Trackmatte
on Oct 28, 2015 at 8:21:06 pm

If you're using a Luma Matte, change it to an Alpha Matte.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Bernhard Walzl
Re: Grey outline Alpha Inverted Trackmatte
on Oct 28, 2015 at 8:22:25 pm

this is using the alpha inverted mask. all the other masks don't give me the result I am looking for.


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Dave LaRonde
Re: Grey outline Alpha Inverted Trackmatte
on Oct 28, 2015 at 9:43:47 pm

Well, what's it look like over a real background? You might be worried about nothing.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Bernhard Walzl
Re: Grey outline Alpha Inverted Trackmatte
on Oct 29, 2015 at 5:13:26 pm

well, that was the reason why i didn't see it at the beginning. i always had a light bachground which worked just fine. until yesterday when the background was dark and i clearly could see it :(


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Cassius Marques
Re: Grey outline Alpha Inverted Trackmatte
on Oct 29, 2015 at 5:36:35 pm

well you got yourself the answer, the letters' halo are caused by the grey pixels originated by the anti-aliasing. you can make it go away with a small simple choke effect or increasing your alpha contrast. (probably after you pre-compose your matte result).


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