Using an expression to make something blink in After Effects is much more efficient than setting a bunch of opacity keyframes, particularly if you have to make adjustments.

In this brusk tutorial video, I show you an expression to employ to make something blink repeatedly. Although there are many ways to arroyo writing an expression for this task, I prefer using the Math.sin equation and creating a speed rate value for like shooting fish in a barrel aligning.

First, create a name for your speed charge per unit and give it a value. Then, create the Math.sin equation, which will return a value between i and -ane. Finally, write an if/else statement to tell After Effects what to do when the returned value is less than zero (in this case, brand the opacity value 0) and what practise to when the returned value is greater than 0 (in this case, make the opacity value 100). Run into beneath:

blinkRate=10;
n=Math.sin(time*blinkRate);
if(n<0) 0;
else 100;