Inconsistent Lumetri White Balance with Multi-Monitor / Mixed-Resolution Display Configuration

Question

Hello everyone, I have stumbled upon a problem - and solution - for what I am simply wondering if this is a known design limitation of Premier Pro: Previously I have been working with a 3 x 24" (1920x1200 resolution for each) display configuration on which I'll often distribute some of my Premiere palettes to each side display while the center display remains my primary workpace. Never had any issues at all with Premiere this way. Now, I've built a new PC and in the process, also decided to replace the center 24" monitor with a 4K 32" (3840x2160 resolution) monitor.

In the course of using the White Balance selector, whether from the Lumetri Color panel itself or the nested Lumetri Color within Effect Controls, I probed a vew areas of my video only to see no change in the measurements, regardless of the color of the area I measured and was very surprised. In one case, I also measured some blue sky only to see the Temp./Tint max out at 300/300! For that particular measurement, I also was seeing the values reset to 0/0 upon measuring other areas of the video.

Through some exploration, what I finally discovered is that if the Lumetri Color panel was on one of the secondary monitors, the White Balance selector doesn't measure the colors correctly. But, bring the Lumetri Color panel into the main workspace of the 4K monitor and everything is just fine. Further exploration also showed that with the Lumetri Color panel on a side monitor, the color measurement results were different if I measured the video in an area of the primary monitor that was above versus reposititioned below a horizontal line 1200 pixels up from the bottom of the screen (corresponding to the vertical dimension of secondary monitors, bottom-aligned to the primary monitor). In fact, it turned out that the measured 300/300 value for Temp./Tint. was the value obtained when measuring above the 1200-px horizon.

The solution for this problem is to always keep the Lumetri Color panel in the same workspace as primary application window, or perhaps specifically whatever monitor is hosting the source video (I didn't confirm this).

Is this a known limitation of Premiere Pro? Are there other tools that may be at risk of working correctly in such a display configuration? This definitely suggests I'll find strong favor in giving up my 2 x 24" monitors for another 32" 4K one.

Thanks!

Daryl

Ambress · Accepted Answer

Thanks, that's quite a variation indeed, and from what conclusions I'm drawing of what I've observed, you wouldn't see this issue....exactly as you said. I have been trying to make a video to illustrate the behavior, but as soon I as I think I have a grip on it and speak to a step I'm about to perform in the video, I get a different result, ha! I already posted one video but saw I'd left out clarifying some things I touched on, so I have been trying to create a more complete and correct video.

In any case, the essence of the problem seems to be that if your main UI monitor is a higher resolution one than a secondary monitor on which you've chosen to place the Lumetri Color panel, then problems with the WB selector tool are likely, and that is especially true if measuring an area of a video where the on screen position of the video is outside an area that a secondary UI montor would define if overlaid on the main UI. For example...and I've been challenged to repeat it...assume two or three bottom-aligned monitors with the center as your main UI and having a vertical resolution twice that of the secondary monitors. If you imagine the main UI vertical center as a horizon line and let's say your video contains a solid block of one color, such as a gray card, that spans across that horizon line, then with the Lumetri Color panel on a secondary UI monitor, you can measure that gray card and obtain different values if you measure above vs. below the horizon. In fact, measuring above the horizon might give extreme offsets such as Temp/Tint 300/300. I'm pretty sure I've also noticed that the color measurement may vary with the color of your deskop wallpaper, strange though that may sound. I really hope I can get a good video together showing all this, if only for the sake of showing curious behavior with an easy fix of keeping Lumetri Color on your main UI monitor.

I would describe the beahvior as the scope of the WB measurement area being defined by the monitor's resoultion on which the Lumetri Color panel resides. If you move the WB selector to an area on the main UI outside what could be "mapped into" the secondary UI space, then the WB selector doesn't seem to know what the color space is for the area being measured, and may even use the desktop wallpaper color as a reference.

R Neil Haugen · Answer

I think your reasoning there is sound ... it must be assuming that you're on essentially the same monitor "space". Neil

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