Expression: Change stroke color over time on Radio Wave Effect

[Dan Ebberts]

I’m not sure how you would do it. I haven’t used Radio Waves much so I might be wrong about this, but it looks like each wave is assigned the current color at birth and is stuck with that color over its lifespan.

Dan

[Kevin Camp]

yep. no way i can think of to do that with radio waves…

you could do it with a particle system, or simply animating a circle (either shape layer or circle effect) and then animating the scale and color of the outline. then you can add the echo effect to create time-offset copies of that animation to make it similar to radio waves.

using the circle effect has the bonus of easily maintaining the line thickness (the shape layer method would need to adjust the line weight as it scales).

Kevin Camp
Art Director
KCPQ, KZJO & KRCW

[Emre Anil]

create a layer under your Radio Waves layer with a Gradient Ramp Effect from red to green (starting point should be at the RW’s center) and set it’s track matte to Radio Wave’s alpha..