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changing a traffic light color

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Ellie Kayechanging a traffic light color
by on Apr 15, 2011 at 1:52:25 pm

Hey, I just need a little “go to” guidance, since, although simple, I’ve never done this before. I need to change a traffic light in a video from yellow to green. Thanks for all the help.

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Jason MettlerRe: changing a traffic light color
by on Apr 15, 2011 at 4:34:49 pm

You'd have to track the movement of the light (Postition, Rotation, and Scale) - I'd use Mocha. Put a masked layer over the light and apply the tracking data. Mess with the layer using Hue and Saturation and layer styles. See this video for tracking:

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Dave LaRondeRe: changing a traffic light color
by on Apr 15, 2011 at 4:53:33 pm

Here's a series of clarifying questions that may lead to an alternative to AE:
What's the form of this stop light image: a still? Is it original art, perhaps? What kind?

Could it be video that's been shot already?
If it is indeed something shot, is it a stoplight hanging over an intersection on a wire, or one on a pole on a street corner?

If you're using video, I'd go for a reshoot if necessary to get a couple of cycles of green-yellow-red on a locked-down camera. Then using simple editing in an NLE, you could get the lights to change whenever you wanted, and it would look absolutely real, because it IS absolutely real.

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

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