Color Correction for Editors - Part II

musicvid10 wrote on 2/1/2014, 1:22 PM
This is a continuation of

For those who are in tune with the first thread, this test gets quite a bit more tricky.
-- These are the combo colors, shifted exactly 30 degrees from the primaries.
-- I've purposely made the magnitudes only half of what they were in the first test, so the differences aren't so obvious. Should present a challenge, even for experienced graders. But it's the kind of challenge that commercial houses deal with every day.

So, the choices for this round (again in no particular order) are:

Many will notice right off that pairs 1 and 5, 2 and 4, and 3 and 6, are all very close in appearance. That's why even good graders need secondary reference points in order to keep their brains in the game.

Use your best judgment; I suggest using deductive reasoning to rule out noncontenders, and again, no cheating. Winner gets two tickets to the Souper Bowl (a charity event) ;?)


larry-peter wrote on 2/1/2014, 2:34 PM
Yeah, this is definitely tougher. I'm going to stick with looking at the areas I did in the first one. My guesses:
1. BC
2. GY
3. MB
4. YR
5. CG
6. RM
john_dennis wrote on 2/1/2014, 4:35 PM
Here are my responses:

Here's my work.

Whether I got any of them correct or not, I had the most difficulty with 3 and 6 using my method.

Project here.

My main system:
Motherboard: ASUS ProArt Z790-CREATOR WIFI
CPU: Intel Core i9-13900K - Core i9 13th Gen Raptor Lake 24-Core (8P+16E) P-core Base Frequency: 3.0 GHz E-core Base Frequency: 2.2 GHz LGA 1700 125W Intel UHD Graphics 770 Desktop Processor - BX8071513900K
GPU: Currently intel on-die video adapter
RAM: CORSAIR Vengeance 64GB (2 x 32GB) 288-Pin PC RAM DDR5 5600 (PC5 44800) Desktop Memory Model CMK64GX5M2B5600C40
Disk O/S & Programs: WD Black SN850 NVMe SSD WDS100T1X0E - SSD - 1 TB - PCIe 4.0 x4 (NVMe)
Disk Active Projects: 1TB & 2TB WD BLACK SN750 NVMe Internal PCI Express 3.0 x4 Solid State Drives
Disk Other: WD Ultrastar/Hitachi Hard Drives: WDBBUR0080BNC-WRSN, HGST HUH728080ALE600, 724040ALE640, HDS3020BLA642
Case: LIAN LI PC-90 Black Aluminum ATX Full Tower Case
CPU cooling: CORSAIR - iCUE H115i RGB PRO XT 280mm Radiator CPU Liquid Cooling System
Power supply: SeaSonic SS-750KM3 750W 80 PLUS GOLD Certified Full Modular Active PFC Power Supply
Drive Bay: Kingwin KF-256-BK 2.5" and 3.5" Trayless Hot Swap Rack with USB 3
Sound card: Realtek S1220A on motherboard. Recording done on another system.
Primary Monitor: Asus ProArt PA248q (24" 1920 x 1200)
O/S: Windows 10 Pro 10.0.19045 Build 19045

Camera: Sony RX10 Model IV

musicvid10 wrote on 2/2/2014, 12:14 PM
What should it be?
Maybe gamma?
larry-peter wrote on 2/2/2014, 12:41 PM
I think color-channel gamma would be a great topic, especially with skin tones. That's where you can make the difference between a plastic look and living skin.
musicvid10 wrote on 2/2/2014, 10:02 PM
I'll be glad to provide the first chapter on gamma basics, with which I am well versed. The second, wrt skin tone enhancements, should be yours, I am thinking.
My focus is more as a corrector, and less as a grader, truth be known.
musicvid10 wrote on 2/4/2014, 9:40 AM
I'll give it a day or two and post the answers.
Hopeful some other oldtimers will sign in on this one . . .
Tim Stannard wrote on 2/4/2014, 11:51 AM
Same as atom12 (without peeking. Honest!)
Dan Sherman wrote on 2/4/2014, 12:32 PM

What is the essential difference between colour correction and colour grading?
Pardon my ignorance.
I'm here to learn.

I am maybe even a bit obsessed with matching shots for colour.
Then I notice in watching some TV shows colours appear to be all over the map to my eye anyway.
Like there is no thought given to colour continuity.
larry-peter wrote on 2/4/2014, 1:37 PM
You'll find several definitions to both, but to me, color correction is more technical in nature. Is the white balance correct, if a chip chart was shot do the vectors align on the scope, levels and chroma legal?

Grading, as GARoss says, is what delivers the "look." A lot of times the "look" isn't "correct," but "correct" is a good place to start developing the "look."
musicvid10 wrote on 2/4/2014, 3:51 PM
Flesh and neutral is correction.
Flesh and teal is grading.
musicvid10 wrote on 2/10/2014, 3:37 PM
Here's the correct list. No one got them all correct, but take heart. I would have puzzled over a couple of choices, had someone else created the test ;?)
1. BC

larry-peter wrote on 2/10/2014, 3:58 PM
A really good test. I was sure I had them right, and now when I look at the answers and the photos together I can't believe I reversed 3 and 6. It seems obvious now.
musicvid10 wrote on 2/10/2014, 11:45 PM
So here's the trap in correcting caucasian skin tones:
Blue or magenta can make the facial look redder, when it's not.
Green (and sometimes cyan) can make the facial look more yellow, when it's not.
So look for a neutral or 'memory" color to compare before you instinctively take away red or yellow.
Doing so unconsciously can make your work "awfully' dull.

Darker skin tones become even a greater challenge, because of spectral response and perceptual changes at lower luminosity. Also daylight Kelvin differences closer to the equator. That's a whole 'nuther topic.

Rory Cooper wrote on 2/11/2014, 6:53 AM
Keeping your look or color match across the entire production doesn’t always apply.
in a practical application say you are doing an EPK on a theatre production say Evita

So generally the exposure would be compliant across the timeline and white balance etc. But now you want to create a look which might be a de saturated hard look to get a feel of people living in poverty overall but this doesn’t mean that the look will be across all cuts = what about the scene changes when dealing with Evita in doors she wasn’t living in poverty so you may want to treat that as brighter soft look with more saturation = she was living it up, the next cut might be out door people scene so then you use the de saturated look in the very next scene so when she is out doors you keep the de saturated look but try and keep some of the colors in her dress for example as normal as possible to get the feel that although she claimed to represent the people her real goals were different. So you can use color to pump up certain emotions or attitudes or messages etc. = grading.
musicvid10 wrote on 2/11/2014, 1:18 PM
Reminds me of the old photofinisher's legend about a lab worker trying to correct a poodle's fur color. They spent hours and wasted a ton of expensive photo paper trying to get it right, finally settling on kind of a muddy tan look.

When the lady came to pick up her enlargements, she was outraged and threw them down in disgust -- She had dyed her poodle bright green for St. Paddy's Day!

Rule #1 is, "Have a second color reference point."
Rule #2 is, "When in doubt, refer to rule #1."
musicvid10 wrote on 2/12/2014, 1:43 AM
You've earned a lot of respect from your insightful responses in this and the previous thread.
Just sayin'
larry-peter wrote on 2/12/2014, 8:12 AM
That means a lot. I always look at the threads you're posting on, cause I always learn something. My approach to the biz has always been more from an artistic point, just learning the tech I needed to get by. I have a lot of appreciation for those who have so much knowledge of both approaches.

<Break in hugfest.>