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Timewarp & Kronos Matte problem....

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Jim DodsonTimewarp & Kronos Matte problem....
by on Jan 6, 2011 at 5:19:02 am

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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Jim DodsonRe: Timewarp & Kronos Matte problem....
by on Jan 6, 2011 at 5:21:11 am

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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Chris WrightRe: Timewarp & Kronos Matte problem....
by on Jan 6, 2011 at 6:25:04 am

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.

http://thefoundry.s3.amazonaws.com/products/kronos/ae/documentation/Kronos_...

http://technicolorsoftware.hostzi.com/


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Jim DodsonRe: Timewarp & Kronos Matte problem....
by on Jan 6, 2011 at 6:42:10 pm

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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Chris WrightRe: Timewarp & Kronos Matte problem....
by on Jan 6, 2011 at 8:22:01 pm

hmm, strange, Did you you precompose the alpha effects/mask layer?

http://technicolorsoftware.hostzi.com/


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Jim DodsonRe: Timewarp & Kronos Matte problem....
by on Jan 6, 2011 at 8:29:15 pm

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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Chris WrightRe: Timewarp & Kronos Matte problem....
by on Jan 6, 2011 at 10:20:22 pm

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.

http://technicolorsoftware.hostzi.com/


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