November 11, 2015 at 12:32PM

0

RED Dragon Green Screen Noise

Hello,

I've been given a RED Dragon footage to key it, but it seems that the noise on it is unbearable.
This is my first time working with R3D, although I have worked with BM raw, XAVC s-log2, slog3, and of course MLraw.

I never encountered noise like this one, I'm not sure if they underexposed it or what, the settings seem to be really fine from here.
Please see the screenshots below and advise:

http://prntscr.com/91p4a8
http://prntscr.com/91p4wg
http://prntscr.com/91p59t

Thanks in advance.

6 Comments

Can you post what the Waveform monitor shows for that scene? My guess is that the caucasian skin is 1-2 stops underexposed, but cannot tell without an objective reference.

November 11, 2015 at 1:06PM

0
Reply

Hello Michael,

Here is a scene and the graphs for it:
http://prntscr.com/91q1sz

http://prntscr.com/91q1gf

Thanks for the help

November 11, 2015 at 1:38PM

3
Reply
Pece Zdravkovski
Studying Film
210

The waveform and the histograms tells you the answer: it's 3-4 stops under-exposed. Of course you can still key it (Resolve's temporal NR is pretty great and works in realtime if you have the GPU grunt; so is Neat Video if you have lots of time to render), but the folks who delivered the footage to you are doing you no favors with the exposure they are using.

BTW, if you want to see some histograms showing what proper exposure in a wide range of scenes and lighting conditions look like, check out Chris McKechnie's latest thread: http://www.reduser.net/forum/showthread.php?138078-R3D-s-The-Power-of-a-... . Those histograms are nice and full across most of the range...

November 11, 2015 at 3:06PM, Edited November 11, 3:28PM

13
Reply

Thank you so much !
I really appreciate this.

Would you have any other tutorials to help me with this kind of stuff ?
So I can stop asking stupid questions.

Thanks again.

Pece Zdravkovski

November 11, 2015 at 3:31PM

i generally always do hsl selections and add a little blur and crank up the saturation on the chroma before keying. try to get the key around the subject even as possible first.
Dont worry if the subject doesnt obtruce the edges. just put a garbage matte.

November 12, 2015 at 11:09AM

0
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Kazu Okuda
Filmmaker
1753

Yikes. Try pushing the ISO if it is not already up super high. It looks like a variety of problems. 1) improper exposure: Caucasian skin not around 60 IRE –use a lightmeter 2) didn't do the fixed noise/black level calibration before the shoot (Red recommends this for each location/lighting scene) 3) possibly chose a super high compression ratio for the shoot. What are the current shot settings?

November 16, 2015 at 4:32PM

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