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Question

Problem with Lumetri curves

Forum|Forum|6 years ago
April 18, 2019
7 replies
4883 views

Hi,

first of all, my English is a bit rusted, so sorry for any mistakes.

I'm using the latest version of Premiere and for some days now I experience a problem with the Lumetri curves.

Whenever I start to alter the lower tones the image gets a yellow-ish tint.

Same happens when I touch the "shadows" and it happens with any footage of any codec I want to use.

This effect does not show when I use the obsolete curves.

I'm right now in the postproduction of a big project, so I hope you can help me out quickly.

Thank you very much,

Chris

lumetri

This topic has been closed for replies.

B

Baffy19

Legend

Reduce the effect of correction in dark areas as in the screenshot (Sat/Sat). This means that your grade or LUT will not affect the dark areas of the image. Then adjust the tone of the skin with a shade (Luma/Sat curves) and make the skin lighter.

R Neil Haugen

Legend

Your media has a yellow cast, and making the part darker is exagerating it. That's why Baffy's suggestion and excellent graphic is so useful.

I use a preset with the Sat-Sat and Luma v Sat set to roll off color casts in the shadows and near-whites. Always.

Neil

Everyone's mileage always varies ...

B

Baffy19

Legend

perfect Neil 🖖

B

Baffy19

Legend

Lumetri, as a tool for color correction, has long been outdated and has been requiring significant changes for a long time. And this is not only fine-tuning the work, but rebalancing all the elements of working with color on the Lumetri page. This tool is as important as it is comparable to the existence of the Premiere program itself. And, unfortunately, many people here do not understand that Lumetry is important in working with the material. This is an integral part of content creation. I'm already tired of writing here and in the user's damn voice. She's old and clumsy. There are no subtle color settings there. Now there are only basic tools for basic color settings. And then in a limited composition.

Jorge Jaramillo Hdz

Known Participant

Hello, I just notice the same Problem (Premiere Pro 2022) the yellow tint added in the curves in lumetri. I tough at first that it was the footage (V-Log Lumix S5), but then I tried to use the RGB Curves (obsolete) and it worked perfectly, no yellow tint, so I'm no longer using the Lumetri Curves.

Have you still experience this problem in recents versions?

R Neil Haugen

Legend

Haven't heard of anyone getting this in a couple years.

Could you share screengrabs, just drag/drop them onto your text reply area.

Aand also make a clip available to download so others can test via Dropbox or whatever?

Neil

Everyone's mileage always varies ...

Jorge Jaramillo Hdz

Known Participant

Thanks

It affects yellow and red tones as you can see.

Up Lumetri Curves

Down RGB Curves (obsolete)

Same settings in Lumetri in both images, just one with Lumetri Curves and the other one with RGB Curves obsolete

cctriadAuthor

Participating Frequently

The new update was just installed and BANG: the curves behave completely different.

I'm "careful" saying that, but the main problem is gone now. There is no yellow-ish tint anymore.

R Neil Haugen

Legend

This is NOT normal behavior in Lumetri ... so let's start with some troubleshooting basics.

First, of course, the standard OS/CPU/RAM/GPU/vRAM, and what Mercury Acceleration option is in use? (Not to blame the hardware, just to see if commonality can be found along the way.)

Next ... what is the media involved, created by ... what? What other effects are involved? And what exact steps did it take to get the behavior?

If you could share a couple frames of a clip, I'd be happy to try and replicate.

Neil

Everyone's mileage always varies ...

cctriadAuthor

Participating Frequently

I'm working with Premiere everyday, that's my job.

I experienced the problem the first time a few days ago, but I thought that I had maybe done something wrong before

locating the problem within the Lumetri curves.A week ago everything was fine. (As I said earlier: I talked to another Premiere

user some hours ago and he told me he had the same problem, waiting for a fix)

For this project I'm running Win 10 (64Bit) on a Dell notebook with an i7-7700HQ , NVidia GTX 1050 Ti, 16GB RAM.

I can't really understand what is happening. As soon as Im touching the curves towards the lower tones, something goes out of control.

R Neil Haugen

Legend

Ann, I understand you want to help but not every problem is a preferences problem. We have to accept at some point that Premiere is full of Bugs. We are all tired of trying to debug and delete our preferences once every now and then. Setting up our preferences again is a time consuming process, which almost every-time has no effect on solving our issues.

Neil, There are 2 or 3 posts with video, if you search for better terms such us lumetri color shift, play/pause, etc, showing why you should not use Lumetri for important jobs. Sure, I've used Lumetri a TON myself for quick projects that I don't care about the color too much. I would NEVER color-correct or grade a commercial or an important job with Lumetri however, knowing It's algorithms are faulty. Several adjustments (exposure, saturation, ect.) produce weird results compared with PRO tools such us DaVinci Resolve. I don't know who you talked to at NAB but that is something almost every PRO editor know.

Besides being around 'here' a few minutes at a time, I also am one of the few "contributing authors" for mixinglight.com, past the three founding colorists. That's a pro colorist's subscription website. My "beat", not too surprisingly, is Premiere, focusing on color. I taught in the Flanders/MixingLight booth at NAB this year, and you can find the chart listing speakers and times online. Tuesday was after the guy in charge of HDR for a major player in creating standards and delivery systems (including certified setups for colorists and theaters) ... and Wednesday was after a guy for whom "He wrote the book ... " would be inaccurate. He's written several of the most-read books among pro colorists.

The MixingLight guys/gals, the colorists in general ... those are the people I tend to be "around" at NAB. They use Resolve, Avid, Baselight, Mistika ... all just tools. None of which are perfect. Oh, and the engineers and program heads at the Adobe booth, of course.

When the colorists I know and work with get a grading project that comes with one or more LUTs, they immediately do stress-tests, as of course nearly every LUT made will break and do not-good-stuff if pushed the wrong way. Then need to know ... and/or create a replacement that accomplishes the main goals without creating problems.

They know how to break every grading app out there. It's their job to know this, right? (Love hanging with those guys & gals.) Some of their shops are still locked down to Resolve 14 as they never found a version of 15.x that was either/both stable and with tools that weren't "broken" in their use. Some are on 15 eager to move to 16 as they test and find it stable. One guy was the major in-booth demonstrator of Resolve 16 run by the big Resolve panel. Good friend.

What ... did I say some think Resolve isn't perfect?

Of course not ... it's a tool made by humans, and well ... if you do certain things in it, weird ... stuff ... happens. As in anything.

Some of the major colorists ... who I am quite comfortable in thinking know a ton more about this than the "almost every pro editor know" ... are quite comfortable and confident of the color science and tools of Lumetri. There are major, award-winning teams that have used Lumetri extensively in their 'film'. And some who've had something odd happen on their system.

Which is a natural part of Life. And is why some shops never moved to Resolve 15 ... on their system, it had problems. For many others, undoubtedly most users, Resolve 15 had at least one version that was both stable and reliable for the tools.

I can't replicate many of the 'issues' that some have with Premiere. And some things I see people having problems with are caused by not running it on a system set up for the intense, hardwired, internal color management that Pr does. Confirmed by the MixingLight founders among others ... Pr is built to tight standards for color. It must be run on a system with OS and monitor set for long-time broadcast standards ... video sRGB, Rec.709, brightness 100nits, D6500, gamma 2.4

Run a calibrated and profiled system for what it is designed to run on, and gee ... suddenly, you can load say RED clips in Pr and Resolve, and pop them both open ... and see identical images. I do ... that's the kind of thing I test for.

And if Robbie, Pat, and Dan couldn't replicate my work, they woudn't 'publish' it.

I'll have a new tutorial up soon there, based on my NAB program ... start to finish, including SDR/HDR viewing, monitors, and exports. Really, at least half the information from that has never been published by Adobe before. And the rest has never really been talked of clearly in one place.

Neil

Everyone's mileage always varies ...

kokmanos

Inspiring

It is a known behavior that has now been acknowledged officially by Adobe. The User-Voice is full with such reports. It makes Lumetri completely useless. Right now the only option is to use good old RGB curves and/or fast color corrector.

Also there are several bugs regarding LUTs, where you see a color shift while playing/pausing.

Alternatively, if you have time, have a look at DaVinci Resolve. It seems Premiere is really far behind in color science from competition.

cctriadAuthor

Participating Frequently

Depressing to hear that.

As you said, it makes Lumetri completely useless.

cctriadAuthor

Participating Frequently

Just talked to a friend and he confirmed the same problem.

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