September 24, 2015 at 10:37AM, Edited September 24, 10:42AM

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Grading VLOG

I've done some testing with the new VLOG-L profile on the GH4, I took the same shot with 3 different profiles to compare them: Cine-D, Natural, and VLOG. All shots at T5.6 and 400 ISO since 400 ISO is the Base of VLOG.

I've noticed a few things, I saw that immediately that the color rendition of the VLOG profile is significantly better than the color of Cine D and Natural, and VLOG is alot easier to push around in post, without quickly mushing up your footage.

Here is a dropbox link that includes my ungraded footage so you can play around with it and compare profiles:

https://www.dropbox.com/sh/9vsafmack7ohcn8/AABPKNbjQYbJCdpMQxWwCylZa?dl=0

I also included a VLOG sample that is slightly under exposed, I noticed with the under exposed image, VLOG falls apart really quickly and you get some really nasty noise and artifacting when pushing it around in post!

Hope you found this as helpful as I did!
Thanks.

9 Comments

Yes, 8-bit LOG recording requires proper exposure because their is no latitude for exposure error. Things are better when recording 10-bit 4:2:2 V-log with an external recorder, but you still want to nail the exposure to get the best results.

September 24, 2015 at 12:29PM

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Guy McLoughlin
Video Producer
31871

My next purchase is definitely going to be the Atomos Ninja Assassin. Recently I've found that 8-bit footage just isn't enough for me.

September 24, 2015 at 1:35PM, Edited September 24, 1:36PM

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Alex Kaldeway
Director of Photography / Editor
251

I have a GH4 with the VLog-L upgrade and also a RED EPIC DRAGON. The reduser.net forum is FULL of posts from folks who naively believed "Hey, with 16.5 stops of DR, I don't even need to thing about proper exposure--the camera will do all the work for me!" and then complained about noisy shadows, etc. Proper exposure /is/ important, whether shooting 8 bit VLog-L, 10 bit VLog-L, or even 12+ bit R3D!

September 25, 2015 at 6:08PM

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Did you overexpose your footage by two stops?

September 26, 2015 at 5:18AM

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Joaquim Barreto
Producer/Director
28

Yes, I over exposed...according to the in camera levels anyways.

September 28, 2015 at 9:08AM

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Alex Kaldeway
Director of Photography / Editor
251

Thanks for sharing. Is it best to slightly over-expose the V Log image then? Obviously not blowing out highlights in the process!

September 26, 2015 at 6:39AM

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That's exactly what I did, I set my exposure with the levels, which ended up being the underexposed shot, Then I set it up again and used my zebra filter to expose and it it looked a lot nicer.

September 28, 2015 at 9:10AM, Edited September 28, 9:10AM

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Alex Kaldeway
Director of Photography / Editor
251

In fact I noticed that when using VLOG with zebra1, you can (and should) always overexpose with about 2 stops. At that point the brightest points are just below the level where they are shown in the zebra (as a pure white warning). Also I found out that ISO 800 produces the lowest noise levels in VLOG. See this video: https://www.youtube.com/watch?v=LjguFhibtR0

When I grade VLOG, I use a simple LUT to bring it into REC709 color space, and then do the rest of the grading. Grading VLOG seems to give better results than the other video profiles.

September 27, 2015 at 6:31PM

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Erwin Hartsuiker
CineVideo-NL videographer
644

800 ISO eh? I would never have guessed that... was your exposure the same for each shot (did you stop down each time you brought your ISO up?)

I have found the grading with VLOG has a lot better results as well, it's the color rendition the profile has, skin tones, and greens turn out a lot nicer than the mushy results I've been getting from Cine-D

September 28, 2015 at 9:12AM

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Alex Kaldeway
Director of Photography / Editor
251

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