After making comparisons using actual content, we settled on Mode 3 because it added a little depth and saturation. Mode 2 ran slightly under 2.2, while Mode 3 was a little over. The only compromise was in the gamma setting.
We worked the fine-resolution RGB sliders and lowered contrast slightly to bring the 27UK850 to a professional level of accuracy. Rec.709 and SMPTE-C offered good gamut precision but fell a little short in grayscale and gamma tracking.Ĭustom is the default mode and it too required tweaking for best results. In fairness to LG, the document does not specify which picture mode was measured. CalibrationĪfter measuring several picture modes, we were surprised to find none of them delivered the results shown on the enclosed factory data sheet.
We saw no reason to change any of them from their default settings.Ĭlicking Reset returns the 27UK850 to its as-delivered state. The General menu has all remaining options, like OSD language, energy saving, sleep mode and the like. It significantly improves the sound quality of the built-in speakers. However, we don’t see why anyone would want to turn MaxxAudio off. In the Sound menu, you can control volume and toggle MaxxAudio on and off. We didn’t need to use this during our tests, as the 27UK850’s gamut is on point. The Six Color menu has hue and saturation controls for all primary and secondary (cyan, magenta, orange) colors. They begin at center-range, which let us achieve accurate grayscale tracking without losing too much contrast.
LG had a driver update that I installed, but that didn't fix it.Color Adjust offers four gamma presets and three color temps, plus a custom mode with RGB sliders. I'm resisting doing systematic tests of what works when because I don't want to jinx an update from LG or Apple. However, if Electric Sheep decided to launch itself when Screen Saver starts, which for some reason it doesn't always feel in the mood to do, then it seems to be harder to get the neon colors back to normal and I sometimes have to restart. So, some combo of unplugging/plugging in Thunderbolt, checking/unchecking HDR, and then closing/opening or opening/closing the lid definitely works every time. I notice that whether this sequence of kludgy fixes takes 1-3 tries seems to depend on whether my MacBook lid was open or not. Unplugging and plugging back in the Thunderbolt cable usually fixes it, although sometimes it also takes the HDR checking/unchecking trick, as well.
My monitor is connected to my CalDigit TS3 Plus via DisplayPort and the CalDigit is connected to the MacBook via Thunderbolt.
Same problem with my LG 27UK650 4KUHD and my 2017 MacBook Pro 15". Just upgraded to Catalina 10.15.4 without googling first whether this would be risky. I've attached two photos I took, one with HDR off showing normal colors but dark shadows and one with HDR on showing the bright neon colors with the blue tint.
I've went to the LG website to see if there's a particular calibration file for this monitor and can only find Windows based calibration settings.Ĭan anyone please help point me in the right direction of how to properly get HDR to appear on this monitor? I much prefer the color of HDR disabled, but after seeing how well HDR brightens up shadows, I'd really like to get HDR working properly. I've tried color calibration to see if I could tone down the colors, but it only seems to allow me to change the white point of the monitor itself. If I uncheck it, the display goes back to how it was before.
If I look in System Preferences > Display, it shows a new High Dynamic Range check box. It almost appears as if the monitor is 'broke'. The screen is now very blue and all the colors are extremely vivid. Now, in settings of the monitor OSD itself, the ONLY control I have is Brightness. Then, this morning I woke up and went to log in, when my monitor turned on, I saw a HDR logo appear at the top right of my screen (the on-screen overlay from my LG monitor). My monitor looked good, so I never complained. Before that, I was unable to view anything in HDR. I've got a 2019 16" Macbook Pro and a LG 27UK650 4K 10-bit HDR monitor connected.