Hello guys, i need some help, i don't even know how to name it, but i am looking for a way to create a controller based on a *.mov lightness that can be linked with other layer.
So lets say i have an optical flare pre-render with flicker, i want a plugin or expression that turns the lightness into a value slider, because i want to link other effects to this slider value so everything is connected and in flow.
By "lightness", do you mean transparency in this case?
You could add a null to your comp and put a "slider control" effect on it. Twirl down the transparency setting on your flare. Alt+click the stopwatch, and then click-drag the little spiral icon to "pick whip" it to the control slider. You can now control the transparency of the flare with the slider.