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AE CS6 - Time Displacement - How To Remove/Improve Banding?

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Dave Manthei
AE CS6 - Time Displacement - How To Remove/Improve Banding?
on May 7, 2013 at 10:50:56 am

Hi everyone,

I've been trying to get a nice slit-scan effect in AE CS6 through the "Time Displacement" effect
by using a ramp or a gradient from white to black as the displacement map
but the outputted result always has banding
i.e. it processes the displacement in "bands" of a few pixels
instead of each pixel line being independent.

Is there some way of solving this?
I see that the "Time Displacement" effect is 16-bit
but I don't know what the solution would be.

I can achieve the refined effect I want using a Processing sketch
but it's massively more time/work/effort/etc.

Here's a screenshot of part of what I'm talking about (@ 100% resolution):

I dropped the footage (1080p) onto a new comp.
Created a new solid. Added a ramp to it (white to black).
Pre-composed the solid. Added Time Displacement to the footage.
Chose the pre-composed solid as the map.

If I change the ramp start and end to shades of gray
the banding gets substantially worse.

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