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Keying an object while giving it a stroke

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caleb barclay
Keying an object while giving it a stroke
on May 15, 2014 at 8:33:48 pm

I'm looking to put a stroke outlining a moving hand. I have Color Keyed the hand but I don't know where to go from here. Is there any way to:

1. Outline object by (x) pixels?
or 2. Add stroke to Keyed object?

I don't want to just make a duplicate hand and scale it behind the original and make it blue. Any ideas?


key-stroke.jpg


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Michael Szalapski
Re: Keying an object while giving it a stroke
on May 15, 2014 at 8:42:41 pm

You could try the Vegas effect using the alpha of the hand layer.
Or Glow.
In either case, you would need to modify it to make a hard line instead of a fading one, but you can do it!

- The Great Szalam
(The 'Great' stands for 'Not So Great, in fact, Extremely Humble')

No trees were harmed in the creation of this message, but several thousand electrons were mildly inconvenienced.


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Dave LaRonde
Re: Keying an object while giving it a stroke
on May 15, 2014 at 9:12:10 pm

There's another good trick to do this using Auto Trace.

You key the subject. There can be noise in the subject as long as it's a good key, it doesn't matter. Then you use Auto Trace, applied to the alpha channel. The result: an animated line around the edge of your subject... and it's separate from the subject layer. Very handy.

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


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Kevin Camp
Re: Keying an object while giving it a stroke
on May 15, 2014 at 9:21:25 pm

and another...

layer>layer styles>stroke.

Kevin Camp
Art Director
KCPQ, KZJO & KRCW


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