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chroma key and the EX-3

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anthony Faulkner
chroma key and the EX-3
on Nov 18, 2009 at 9:56:37 am

I recently bought an EX-3 and shot some green screen footage today.

My editing is in FCP 6.2.3? (My computer is at the office and i am now home!!!) On initial look the keying was suprisingly bad in 1080P 30. It seems to shift the color of the image and the edge is no where near as good as i was imagining it would be.

Should i be using AE?

How are other people getting a good key from this camera?

please let me know if you have any suggestions regarding software, or settings.

thanks
Anthony


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Craig Seeman
Re: chroma key and the EX-3
on Nov 18, 2009 at 2:39:29 pm

I've shot green screen at 1080p30 and get amazing one click clean keys just using the mediocre built in keyer in FCP. Others get the similar results.

[anthony Faulkner] "It seems to shift the color of the image"
??? What "it" can shift the color? It seems either the issue is your lighting or your keying technique is at issue.





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Greg Ondera
Re: chroma key and the EX-3
on Nov 18, 2009 at 4:01:36 pm

There is a case for pulling the key from the HD/SDI output which has a 4:2:2 signal. I don't pull a lot of keys, but I understand taking a key from the SxS cards which is 4:0:0 is not the best way to do it. One needs something like the Convergent Designs recorder. <http://www.convergent-design.com/index.html>

Greg Ondera
http://www.Plexus.tv
http://www.SurgeonToday.org


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Craig Seeman
Re: chroma key and the EX-3
on Nov 18, 2009 at 4:17:45 pm

[Greg Ondera] "but I understand taking a key from the SxS cards which is 4:0:0 is not the best way to do it."

I wish people wouldn't misinform people. The files on the cards are 4:2:0. In progressive mode they key well. Of course 10 bit uncompressed 4:2:2 HD-SDI and a recording to nanoFlash would be better but I've pulled EXCELLENT keys from the files off the SxS cards. The pixel density is so high on the recordings that in progressive mode you can get very smooth clean edges short of zooming in over 100% to examine them.



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Barry Bishop
Re: chroma key and the EX-3
on Nov 18, 2009 at 9:16:04 pm

EX camera does a great job keying if you do it right, and you arn't having noise/grain/artifacting.

I use keylight and motion for chroma keying Both work very well.
For about 1,200 u can use Matrox mx02 and it will provide 4:2:2 keys as well. You just need to know the workflow.

Convergent is portable and is expensive.
MXO2 isn't portable but is cheaper.

Barry
Associate Web Producer/ Video Editor


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Rick Diamond
Re: chroma key and the EX-3
on Nov 18, 2009 at 11:16:43 pm

I have an MXO2. How do I go about using it to key?


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Barry Bishop
Re: chroma key and the EX-3
on Nov 19, 2009 at 2:34:11 am

Camera HD-SDI ->MX02 HD-SDI in->to computer->Capture software of choice->compositing software of your choice.

Barry
Associate Web Producer/ Video Editor


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Ron Pestes
Re: chroma key and the EX-3
on Nov 18, 2009 at 11:05:43 pm

I believe he color space for XD CAM EX from the SXS cards is 4:2:0 not 4:0:0.

Apple Certified Master Pro FCS 2
Sony EX-3
MacBook Pro


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anthony Faulkner
Re: chroma key and the EX-3
on Nov 19, 2009 at 2:53:32 am

Thanks for your advice, actually this morning ive got a handle on it. You are right it was my sequence settings that were at fault. Everything is looking FINE!!!



another happy camper!!



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Dean Sensui
Re: chroma key and the EX-3
on Nov 20, 2009 at 12:05:53 pm

This was shot with an EX1. 1920x1080 p30.

Recorded to an SxS card. EEFX.com green screen material. Two Lowel Tota Lights, two Lowel DP lights and a fan. Composited in After Effects using Primatte & Composite Wizard.

http://hawaiigoesfishing.com/greenscreen_demo.html

Dean Sensui -- Hawaii Goes Fishing


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