How to map blur to position for film-jitter like effect

Question

I am using the "wiggle" expression on Position to create a film jitter effect.

How can I map a blur to the position of the layer, so that it blurs in relation to the movement caused by that jitter? I'm not looking to blur the images in the footage based on their 'motion' (ie - the baseball flies across the screen - I'm not looking to blue that) but just a motion blur based on the movement of the whole frame.

Dan Ebberts · Accepted Answer

You could try applying a Directional Blur effect to your footage and tie the blur Direction parameter to your Position wiggle's velocity with an expression like this:

v = position.velocity;
-radiansToDegrees(Math.atan2(v[0],v[1]))

and use an expression like this for Blur Length:

m = .5;
position.speed*m

where you adjust the multiplier variable (m) to get the amount of blur you want. Something like that.

Mylenium · Answer

Could be as trivial as feeding the wiggle() as a driver into a linear() expression to remap the value ranges. The only prerequisite would be for the wiggle() to exist on a "neutral" control before feeding it into anything or else you end up getting weird values and inconsistencies in the randomness. So apply the wiggle() to a custom expressions slider and then feed it into the position and blur with a pickwhip expression.

Mylenium

Sign up

To post, reply, or follow discussions, please sign in with your Adobe ID.

Sign in to Adobe Community

To post, reply, or follow discussions, please sign in with your Adobe ID.