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Yet another impossible key

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Dumeyni Arnaud
Yet another impossible key
on Oct 19, 2009 at 9:52:22 am

Hi all,
I've been trying to key out this guy :
http://lpcfoubis.free.fr/preview/rush_itw.mov

Source is DV sd... I couldn't work on the original capture so I had them to transfer me the rush via the ProRes codec ( QT animation wasn't possible, slow servers and conections )

I'm very unsastified with the results as you can see below.

http://lpcfoubis.free.fr/preview/final_sample.mov

I made 3 keys ( clothes, head left and right )
I think I tried everything, deartificating and denoising helped a lot but its still not enough... Every techniques or keyers I used destroyed the small amount of hair he had left.

Is there more I can do ?



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Marcello Mazzilli
Re: Yet another impossible key
on Oct 19, 2009 at 11:43:13 am

Are you using any plugin. I found that Ultimatte is very good.
M

siRoma di Marcello Mazzilli
Corporate video productions in Italy
http://www.siroma.com


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Dumeyni Arnaud
Re: Yet another impossible key
on Oct 19, 2009 at 12:17:29 pm

Hi Marcello

I used keylight and Primatte, never tried Ultimatte.




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Anthony Marzilli
Re: Yet another impossible key
on Oct 19, 2009 at 2:12:46 pm

Hey Marcello,
I just got to quickly say.... nice last name. Don't see too many close to this.


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Marcello Mazzilli
Re: Yet another impossible key
on Oct 19, 2009 at 2:28:57 pm

ahahah..... Here in Italy is more common I guess

siRoma di Marcello Mazzilli
Corporate video productions in Italy
http://www.siroma.com


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Christopher Wright
Re: Yet another impossible key
on Oct 19, 2009 at 6:31:04 pm

I have actually had great success with Boris Continuum's Chroma Key plug-in.
Especially with the blue you are trying to key out.

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Alan Okey
Re: Yet another impossible key
on Oct 19, 2009 at 6:52:44 pm

Your source footage is terrible, therefore the results are guaranteed to be disappointing. If a good key was important to the client, they should have shot the talent against a proper green screen (not blue) using a proper format (not DV). I'm frankly surprised that your key looks as good as it does given the source material. Nice work.


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Dave LaRonde
Re: Yet another impossible key
on Oct 19, 2009 at 7:06:15 pm

Actually, that's a good-looking key, considering the poor lighting -- it is absolutely HORRIBLE -- and that it was shot on DV.

Whether the chroma key background is blue or green is largely irrelevant. The reason green is typically preferred is because most cameras use the green channel for the luminance part of the picture. But with good-looking video, it doesn't make all that much of a difference.

Does shooting on DV really make that much of a difference? It certainly does! DV has abysmal color resolution. If you've never heard of color resolution before, you should watch this podcast, which gets into the issue of color resolution:

http://macbreak.libsyn.com/index.php?post_id=70596

After you're done watching it, keep in mind that PAL DV's 4-2-0 color resolution is just as bad as NTSC's 4-1-1 color resolution. Shooting with HDV is just as bad.

Shooting with something that has 4-2-2 color resolution, like the Panasonic HVX 200 P2 camera, is pretty good.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Chris Wright
Re: Yet another impossible key
on Oct 19, 2009 at 11:35:09 pm

I couldn't truly test a key on your sample because it's only 500 pixels, but I do have a few suggestions.

()do you have primatte 4.0 or later?

()use more core garbage mattes that way you can use fine tuning button without fear of damage

()rely less on strinking mattes, and more on inward defocus. strinking directly deletes detail.



http://technicolorsoftware.hostzi.com/


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Dumeyni Arnaud
Re: Yet another impossible key
on Oct 20, 2009 at 8:42:14 am

Thanks for the positive feedback :)

This interview was important and as Alan said, it looked like they didn't cared about it. But since I wasn't involved in the shooting I couldn't tell them they were doing it wrong, is it always like that ?

Nice link Dave, I heard about the 4-2-0 color but now I understand why it looks horrible even in HDV.

Downloaded demo of chromakey from boris, will try.

I've been playing with Primatte and garbage mattes with the head, the inward defocus helps, but I got a weird dark green color on his hair, pic related :



Looking at the source footage his hair is already a little green, so maybe it just a color correction problem and not spill.

Source material in higher res : http://lpcfoubis.free.fr/preview/sample_itw.zip



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Marcello Mazzilli
Re: Yet another impossible key
on Oct 20, 2009 at 8:51:07 am

I really suggest Ultimatte.. should give it a try

siRoma di Marcello Mazzilli
Corporate video productions in Italy
http://www.siroma.com


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