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Timewarp & Kronos Matte problem….
I’ve tried this with both Timewarp and Kronos and the problem is the same with both:
I have a wide shot of a car pulling up to a house — no camera movement — and I am applying a 200% speed change to it.
At 200% speed: As the car pulls up to the curb, the lawn in front of the house morphs and is affected by the car’s movement. So I did a very precise roto around the car and used that precomposed roto layer as a matte for Timewarp & Kronos..
Unfortunately, the matte has no effect on reducing the artifacts…
I tried fiddling with Luma/Luma Inverted/Alpha and Alpha Inverted and none seem to improve things at all…
In a previous post it was suggested to do a loose roto around the foreground… Is my roto too tight? (It is precise to the car).
My workaround is to use my perfect roto — do a timewarp on that layer and lay it on top of a frame blended BG… But I’d really love to see the matte layer working!!
Any thoughts?!
Jim Dodson
8 Core Intel — Mac – OSX
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6 Replies
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PS, I am assuming I am supposed to be roto’ing the non-speed changed layer? (i.e. all the original frames)?
Is that correct or should I roto only the shorter scene after the 200% speed increase?
Jim Dodson
8 Core Intel — Mac – OSX
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You MUST pre-compose your matte layer before you use it or Kronos uses the source layer without any effects that you apply.
Please read the full documentation in pdf form.
https://thefoundry.s3.amazonaws.com/products/kronos/ae/documentation/Kronos_5.0_AE_UserGuide.pdf
https://technicolorsoftware.hostzi.com/
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Thanks Chris, but I definitely did precompose before using the matte…
Any thoughts about the fact that the matte is exact — not loose?
Or any other thoughts??
Jim Dodson
8 Core Intel — Mac – OSX
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hmm, strange, Did you you precompose the alpha effects/mask layer?
https://technicolorsoftware.hostzi.com/
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You mean did I double pre-compose – once for the alpha layer and then again for the Matte?
Jim Dodson
8 Core Intel — Mac – OSX
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Well, RGB Straight uses the bounding box alpha instead of the matte alpha.
I don’t know if you’re using alpha mattes, but definitely read page 27 in the pdf. You should follow Foundry’s user’s guide to the letter.
Short of handing me your project, I don’t know why it’s failing for you. Maybe you’re using h.264 footage.
https://technicolorsoftware.hostzi.com/
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