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Gradient controlled time remapping? (Rolling shutter effect)

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Mathias Kalhauge
Gradient controlled time remapping? (Rolling shutter effect)
on Sep 17, 2018 at 8:22:14 am

Hey, so I'm trying to make a, sort of, rolling shutter effect to a layer in After Effects, but I don't know how to go about this.
My only guess is that I need to make an expression in time remapping, which looks at a gradient to determine how much delay is needed - using Dan Ebberts' method:
x = thisComp.layer("Gradient").sampleImage(transform.position, [.5,.5]/2, true, time)[0];
100*[x,x]

The only problem is that it will affect the entire image, instead of affecting it in segments, just like rolling shutter does.
Does anyone know how to do this properly?


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Kalleheikki Kannisto
Re: Gradient controlled time remapping? (Rolling shutter effect)
on Sep 17, 2018 at 4:10:54 pm

"Gradient-controlled time remapping" describes the time displacement effect.

https://helpx.adobe.com/after-effects/using/time-effects.html#time_displace...

Considering it will look at the full frames that actually exist in the footage rather than trying to recreate in-between motion, it will not exactly be rolling shutter effect. The time displacement needs to be several frames to create a proper result, so it is more of a slit-scan effect.

Rolling shutter would be motion that occurs in less than one frame. You could conceivably achieve a rolling shutter type effect if you generated additional footage between frames with pixel blend.

Kalleheikki Kannisto
Senior Graphic Designer


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Mathias Kalhauge
Re: Gradient controlled time remapping? (Rolling shutter effect)
on Sep 18, 2018 at 1:00:14 pm

Thanks man!
Time Displacement works great


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