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Roto out of focus /blurred objects
Hi there, had a quick search no result so :
I’m replacing the screen of a laptop, and an actors shoulder and occasional arm obstructs the screen.
I’ve made a mask, with quite a lot of feather, which works in most shots, but occasionally there will be left-overs from the old screen left in the blurred area. This happens also in the frame of the laptopscreen where the original blur and my feather meet, so you will see a hard-ish edge from the original blur and mine.
The biggest problem is in the motion blur.
Is there any standard way to.. “unmult” or solve this? -
4 Replies
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The short answer is no.
The long answer is that if you’re willing to work with the Roto Brush for a while, you can probably come up with something pretty good, but there are limitations to it, and if there’s a lot of motion blur you will be in for a fair bit of headache. But – it can be done. Just make sure you explore the various functions of the Roto Brush first, and be sure to “Decontaminate Edge Colors”
Good luck!
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Steve Renard
Media Director, Cicada Design Inc.
and Freelance Know-it-all
647-406-7991
srenard@cicadadesign.ca
http://www.cicadadesign.ca -
If you roto-ed in Mocha, you can apply its per-vertex motion blur feature which can be keyframed. This feature also allows you to see your masks with motion blur, as you proceed with your task. This precludes a lot of the guesswork required when applying motion blur after rotoing.
HTH
RoRKIntensive AE Training in South East Asia.
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Thanks for the answers.
They are quite short clips, so I guess I could give it a try in Mocha tomorrow. Although I’ve never done that before, so it’s a bit of a risk spending time on it.
Shal try with rotobrush as well. -
I ended up using the rotobrush and spent round two hours on a seven second 4k shot(!). The first few shots were made with a mask feathered up to 190px, but some the obscuring object covered to much of the screen to be replaced, and there the Rotobrush with its Decontamination function seemed to be the only solution. It did a great job!
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