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Ghost Trails
So I’ve tried two different ways of acheiving an effect.
I have footage of a person, brightly lit against a black background, so I can superimpose them as a ghost.
I was trying to add little trails streaming off of them. One method I used was shooting microscopic particles at them from one side and mapped the persistent property to enlarge the particles when they hit the bright spots. It got a decent look, but took five hours to process half a second of footage.
Another method I tried was an echo, where I slid the composition one direction, echoed it, and then slid it backwards (matching the two slides with expressions) so that the original looked still but the echoes slid away. But this one ended up running even slower.
So, any other suggestions I could try, so I can find one that runs more quickly?
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1 Reply
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Use a luma key on one copy of your footage to have the person on one layer.
On the duplicate copy (underneath the other one) do some sort of extending blur. You could do radial blur (slow), Shine (faster), Pete Warden’s smear or whatever it’s called (fast), AE’s motion blur, etc.
Then use a fractal noise layer as a track matte. To give your streaks of light a smoky feel.
That’s just one way.
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