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Proper Chroma Key procedure with R3Ds?

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Joshua Dixon
Proper Chroma Key procedure with R3Ds?
on Feb 8, 2011 at 6:43:34 pm

I am preparing to shoot a green screen scene on a Red One Mysterium X.

What would be the best procedure for post? The backgrounds will be matte paintings etc...

We have access to Nuke, Motion, Shake, AE, and Maya for Compositing.

We will be cutting the sequence in FCP.

Thanks for any help!

-Joshua Dixon
Director, DP, Editor, RED One MX Owner/Operator
joshuadixon(at)me.com
http://www.joshuadixonmedia.com
http://www.redmxrental.com


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Noah Kadner
Re: Proper Chroma Key procedure with R3Ds?
on Feb 9, 2011 at 3:09:52 am

Really depends on your final destination- this going to film or 1080? Definitely DPX or TIF 1920x1080 2K would be a solid possibility. It may not be necessary to comp in 4K unless you're going out to film, even then maybe not.

Noah

Unlock the secrets of 24p, HD and Final Cut Studio with Call Box Training. Featuring the Canon 5D Mark II and 7D.


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Russell Lasson
Re: Proper Chroma Key procedure with R3Ds?
on Feb 9, 2011 at 6:34:33 pm

Just a couple of quick thoughts on green screen with the MX sensor:

- Just because you can shoot at 800 ISO, I would still lean towards exposing closer to 320 ISO. The more light usually means a cleaner key.

- If you're lighting with tungsten, I would still put a blue filter on the lens. This has much less to do with noise like it did with the original sensor and more to do with getting colors that are more true.

- White balance on set. This helps in post so that you can process your footage as close to true color as you can. If you don't and you don't have a good reference to white balance from, you can just be doing some guess work.

- When pulling the key, either use the R3D files in a program that supports it or render out to a 444 codec. DPX, TIFF and ProRes 4444 are all good options. Rarely have we ever really pulled keys from the original 4K resolution. If you do, consider using ProRes 4444 at 4K to help control files sizes. Also consider rendering at 3K or even 2.5K if you want.

- If a key isn't working great, you can try to change the white balance and exposure from the original R3D to see if that helps.

- I haven't had time to try it yet, but we've been talking about shooting at a faster shutter to limit motion blur. One you've pulled the key, then use a program like RE:Vision Effects ReelSmart Motion Blur. Again, I haven't tried this workflow, but it seems very promising for green screen.

Those are just some of my thoughts. Good luck!

Russ

Russell Lasson
Colorist/Digital Cinema Specialist
Color Mill
Salt Lake City, UT
http://www.colormill.net


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Joshua Dixon
Re: Proper Chroma Key procedure with R3Ds?
on Feb 9, 2011 at 8:11:54 pm

Noah, it will be distributed on film, also we will want to distribute on DVD. But I am assuming since film is involved that we should focus on that aspect?

-Joshua Dixon
Director, DP, Editor, RED One MX Owner/Operator
joshuadixon(at)me.com
http://www.joshuadixonmedia.com
http://www.redmxrental.com


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Joshua Dixon
Re: Proper Chroma Key procedure with R3Ds?
on Feb 9, 2011 at 8:14:55 pm

Russell, would you mind if I posted this info you just submitted on my blog? I\'ll make sure to give you credit and a link to your demo reel/website. I just think it\'s great info I can put out there for others.

-Joshua Dixon
Director, DP, Editor, RED One MX Owner/Operator
joshuadixon(at)me.com
http://www.joshuadixonmedia.com
http://www.redmxrental.com


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Noah Kadner
Re: Proper Chroma Key procedure with R3Ds?
on Feb 10, 2011 at 4:20:51 am

I'd confer with whomever is doing the VFX. In general 2K should be more than sufficient while keeping file sizes manageable. delivering 2K TIF sequences to your VFX folks should be ok.

Noah

Unlock the secrets of 24p, HD and Final Cut Studio with Call Box Training. Featuring the Canon 5D Mark II and 7D.


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Russell Lasson
Re: Proper Chroma Key procedure with R3Ds?
on Feb 11, 2011 at 2:23:36 am

You can post my thoughts on this. Just note that I shoot very little. I'm a post guy that philosophizes on how to make my job easier. I did shoot some tests this morning to try to figure out if adding a blue filter helps in low tungsten light, but the only blue filter I ended up having on hand was an 80A. Way too much blue. Oh well.

Russ

Russell Lasson
Colorist/Digital Cinema Specialist
Color Mill
Salt Lake City, UT
http://www.colormill.net


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Uli Plank
Re: Proper Chroma Key procedure with R3Ds?
on Feb 12, 2011 at 7:32:45 am

If you have the M sensor, turning using half of that into blue helps. The MX doesn't really need it.

Director of the Institute of Media Research (IMF) at Braunschweig University of Arts


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