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creating a matte for Twixtor

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wArden
creating a matte for Twixtor
on Dec 16, 2005 at 2:41:05 pm

I'm still using the demo version for Twixtor. I've been having some good luck with some shots and some wonkiness with others.

This question is somewhat related to Twixtor so I'd thought I'd ask: Is there somewhere that shows you how to create a matte for a foreground object (or can someone give me some tips?), much like the one in the tutorial so I can use it as the Alt Motion Source? In the tutorial it has a woman standing in a field and then when the matte is made she is completely white and the background is completely black.
How do you do that so the fore and background are so defined?

btw I'm using Final Cut Pro 4.5.

Thanks.


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Pierre Jasmin
Re: creating a matte for Twixtor
on Dec 16, 2005 at 6:05:17 pm


You don't use a matte as an ALT source. The Foreground-Background segmentation matte is only an option in Twixtor PRO. The ALT source is your friend to enhance the image (when you have dark or low-contrast imagery (eg more contrast without clipping) or to revert to use the original source if what you are retiming receive a lot of treatment and as a result has not much details left.

Unfortunately Final Cut Pro does not have roto tools other then the simple garbage matte tool, "masking" tools one uses when process like 'keying' are not sufficient. Products like Combustion or Motion or stand-alones like Silhouette Roto have better toolset for the purpose of making such a matte. Of course when the camera moves, building such matte can be a lot of hand work.

Pierre


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wArden
Re: creating a matte for Twixtor
on Dec 16, 2005 at 6:42:08 pm

You can use Twixtor with Motion?


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Pierre Jasmin
Re: creating a matte for Twixtor
on Dec 16, 2005 at 11:57:11 pm


I don't think Twixtor runs yet in Motion (supporting AE plugins does not seem a priority over there). I am saying maybe if you have the Apple Production Studio that comes with a copy of Motion then maybe you could use that to make a better matte and render it and import it in Motion.

It would be cool if Apple fixed and expanded their AE plugin support :) - Send bugs for plugins like Twixtor not working well in Motion )others have problems with FCP) to:

http://www.apple.com/feedback/motion.html
http://www.apple.com/feedback/finalcutpro.html

Pierre




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Pierre Jasmin
Re: creating a matte for Twixtor - Typo
on Dec 16, 2005 at 11:58:09 pm

I meant reimport in FCP

Pierre


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wArden
Re: creating a matte for Twixtor
on Dec 19, 2005 at 3:34:18 pm

Thanks for the help. Surprising how limiting FCP is with something like this considering Apple sells it as a cutting-edge program. :


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wArden
Re: creating a matte for Twixtor
on Dec 16, 2005 at 7:04:44 pm

So, you could alter the colours, brightness and/or contrast for an Alt Source so there is more definition between elements of your shot so that Twixtor's vectors can better calculate the motion? Correct?

Or, is it better to make a matte, like I mentioned earlier, and use the Pro version? Or is that type of thing supported by FCP?


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shin kurokawa
Re: creating a matte for Twixtor
on Dec 16, 2005 at 11:01:51 pm

I find that, in general, a combination of mattes
and secondary processing (despite being labor/render-
intensive) would give better results,
but obviously this is a case-by-case thing.
The more motion content there is in the source,
the more complex your workflow may need to be.

Although it's useful to preprocess low-detailed
(spatially as well as temporally), noisy sources
and feed that as secondary-source, it's also
possible to easily reach a point of diminishing
return. Seems the preprocessing option in 4.5
will do much of what we had to do
pre 4.5, and it's that much simpler.

Also, of the tools mentioned, SR and C* are
excellent for creating mattes of this type.
HTH,
-Shin




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wArden
Re: creating a matte for Twixtor
on Dec 19, 2005 at 3:35:20 pm

Thanks for the input. I will try a little more experimenting. :)


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