Color gamut setting for 2016 LG UHD OLED/LCD TVs

[mar3o]

Can we get a final word on what to set color gamut to when watching UHD/HDR content on LG 2016 UHD OLED/LCD TVs? There's a choice of normal, wide and extended. I have read in the past that with LG sets, normal and wide don't act as you think they should, and you should always select normal, even for UHD, because wide over-saturates the image. However, the more I experiment, the more I wonder if this is incorrect, and the correct setting for UHD should be the obvious setting - wide?

Here's a video on the topic, by HDTVtest (it's a short 2-minute video):

LG 2016 OLED TV Color Gamut Setting: Normal or Wide? - YouTube

"..Surprisingly, even some professional calibrators who charge hundreds for their service gets this wrong...According to our own testing and discussions with LG engineers, when watching Ultra-HD blu-rays on LG UHD TVS, the correct setting is color gamut normal.

Here's how it works - when setting color gamut to normal, the TV will see the rec-2020 avi info frame content within the Ultra-HD blu-ray signal, and go into 2020 mode to track UHD colors correctly. If you set color gamut to wide, it will force the TV to track DCI-P3, when in actual fact, the signalling on 4k blu-rays is done within a rec-2020 container. This is the reason why skin tones can go redder with color gamut wide.

There's another major problem with using color gamut wide - it blows out the colored highlight detail...So there you have it - color gamut should be set to normal for watching 4k blu-rays, or any content in fact, on 2016 LG OLEDs."

Rtings says this about a different 2016 LG TV:

"For over-saturated colors, set 'Color Gamut' to 'Wide'. For a more accurate picture, leave it to 'Standard'."

Can anybody confirm this? This video sounds pretty definitive on the matter. My LG UH8500 is an LCD UHD set, but I would imagine their wide color gamut settings would act the same for both OLED and LCD, since both their 2016 OLEDs and their LCDs have the exact same color gamut settings.

If we are always supposed to use normal for everything, then why do we have a setting for wide? It would be common sense that when we want wide color gamut for UHD content, we would want to select wide color gamut on the TV? But this video says to get wide color gamut, we should select normal, not wide!! Whaaa? No wonder people are confused with UHD sets. Can anybody please explain this?

Is "normal" really "auto", and that's why it should be left on normal? It sounds like maybe LG just mislabeled it, because it sounds like normal auto-detects, but by labeling it "normal", it sound like it means standard color gamut (rec 709).