Answered Colour gamut setting

Discussion in 'LG TVs Forum' started by muffins, Aug 23, 2018.


    1. muffins

      muffins
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      It is recommended to set colour gamut to auto on lg’s oled’s. When watching a 4K HDR movie it should then change to wide. Why is it then that when watching a 4K movie if I change colour gamut to wide, the colour changes. If it is set to auto, and it detects a 4K movie and I change it to wide, there shouldn’t be a colour change?
       
    2. Best Answer:
      Post #21 by Monstieur, May 17, 2019 (3 points)
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    3. muffins

      muffins
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      Just doing a back to back with Star Trek beyond in 4K HDR, and on Netflix in 1080P. I can see the difference in resolution, and the HDR bit the colour gamut looks exactly the same. I would have thought the colour in 4K would have been wide?
       
    4. byron_hinson

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      auto is the right setting. Forcing “wide”via the menu isn’t needed as it saturates the colours more. The Films etc are already making use of WCG and the TV won’t show a colour gamet change in the menu.
       
    5. muffins

      muffins
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      I wish lg would label their settings better. Or I should perhaps get a player that supports Dolby Vision?
       
    6. crypticc

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      They used to call it "normal" and complaints presumably caused them to change the auto mode which is correct for all sources and resolutions to "auto".
      What are they supposed to call it? Not widened? Not stretched?
       
      Last edited: Aug 27, 2018
    7. muffins

      muffins
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      I really don’t think it does anything auto. It just stays at normal as far as I can see.
       
    8. GlennTidbury

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      I think that what people are saying is that the setting "label" doesn't change, it will still say normal or auto..... But that HDR material is automatically making use of the wider colour gamut compared to SDR content. This should be evident in the picture quality.
       
    9. byron_hinson

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      Auto chooses what the content tells it to. The setting doesn’t change.
       
    10. muffins

      muffins
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      I understand that. But aren’t 4K HDR movies mastered with a wide colour gamut? So if I put a movie on then it automatically changes to wide, then if I change it from auto to wide, there should be no change? Except the colour does change when I do that.

      Also like I posted I did a back to back with 4K HDR and 1080p and the colour was the same.
       
    11. byron_hinson

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      WCG doesn’t mean everything is garish like you changing the colour gamet yourself. It’s sometimes subtle

      On TVs. Changing to wide yourself forces colours which were not meant to be used
       
    12. GlennTidbury

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      #2 Best Answer
      the settings are just poorly labelled....and also the terms "wide colour gamut" is kind of vague, doesn't really mean anything specific beyond marketing terms.

      SDR material typically uses REC709, for this material "auto"/"normal" will give the correct spectrum of colours to match the source...."wide"/"extended" will push colours more towards the vivid end, to make everything seem more saturated...doesn't actually widen the available colours.

      HDR material typically uses BT2020 (which has a broader colour palette), for this material "auto"/"normal" will give you the correct spectrum of colours to match the source...."wide"/"extended" will push colours more towards the vivid end, to make everything seem more saturated...doesn't actually widen the available colours.

      The settings are (as with many things in most TV's) labelled in a very confusing way, but basically auto/normal will display the content as intended from the source material, wide/extended will alter the image in an attempt to produce a more vibrant, but less accurate image.
       
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    13. ppearson1975

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      I asked this same question myself in this forum, and based on the answers I got, the conclusion I've come to is that the setting "Wide" doesn't actually mean "Force use of the wide colour gamut as provided by the input". It actually means "use LGs own made-up 'wide' colour pallet which is more saturated than the standard WCG provided by the input". It's certainly not the only unintuitive label in the settings menus...
       
    14. muffins

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      Should I be seeing a difference in colour between 1080P and 4K HDR?
       
    15. GlennTidbury

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      Only in terms of the fact that hdr has wider range of colour shades available. So HDR allows for deeper colour shadows, and brighter highlights, and smoother colour gradients between all the different shades.

      HDR displays can display much brighter and much darker ranges, and more range of colours between those two peaks.

      I'm not quite sure how else to explain it.

      ::edit::

      Sorry, I assume you mean 1080p SDR and 4k HDR?

      The first part 1080 Vs 4k is the resolution, i.e. how many tiny dots the picture is made up of.... More means potentially more detail, or to put it another way, smoother lines for bigger screen sizes instead of seeing big pixels.
       
    16. muffins

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      Yes I see what you mean now about gradation. I never even thought of that.

      It’s just when you’re reading reviews on 4K HDR movies they go one about the wider colour gamut, going on about how the blues are more blue and so on.

      Just when flicking between 4K HDR and 1080p I never saw a difference in colour, as was reviewed.

      It also got me thinking why Dolby vision locks colour gamut to wide and HDR is said to be set to auto for best image.

      I suppose I’m only really just fretting over it because I have nothing to complain about in terms of pq on my tv.
       
    17. Dale2709

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      Which forum did you see this in
       
    18. crypticc

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      So just to complicate things, resetting settings leaves the gamut as normal, except when watching 3d.

      Any idea if we should use that? Has anyone calibrated their sets for 3d through say the LG spec?

      Cheers
      Chris
       
    19. GlennTidbury

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      So far as I know, same rules apply. When my set was pro calibrated,3d was also on normal, not wide or extended. Same reasons, wide/extended don't actually increase anything, they just shift the lower end a bit further up.
       
    20. mart!

      mart!
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      Thank you, this is very well stated. Any idea why DV and Game modes default to Wide with no way of changing the setting? Shouldn't they be set to Auto really too?
       
    21. GlennTidbury

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      I don't know for definite.... But I'm assuming that what the setting says there is irrelevant, as it doesn't use the same system. DV is dynamic, so won't necessarily rely on fixed points in the same way that the other modes do?

      Something like that, I'm not really sure 100%.

      I think it's similar to the way that HDR modes still have a gamma setting that's "locked" to 2.2..... Greyed out.... But that doesn't mean it's using a traditional 2.2 gamma curve.... It's just not a relevant setting because hdr uses a different system, eotf.

      Sometimes settings are greyed out simply because they're not used for a particular content or picture mode I think.
       
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    22. Monstieur

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      Best Answer
      Wide exposes the panel's native gamut and does not conform to any standard colour space. It should only be used in a fully colour managed workflow after profiling the display.

      Normal (sRGB) and Auto (sRGB / BT.2020) are the only correct settings for consumer content. They restrict the native wide(r) gamut of the panel to match the content's colour space.
       
    23. crypticc

      crypticc
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      Bit of a thread bump. But oh, what a bump. Best answer ever
       
    24. davexnet

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      The thing that bothers me and undermines the whole discussion somewhat is
      that the TV itself *chooses* wide by default when the HDR signal is detected.
      You can certainly go in and set it to "auto", turn off TruMotion, etc,etc. It also
      sets dynamic contrast and color to "medium" for HDR signals. (probably OK - I think)

      Come to think of it, even when receiving plain old rec.709 and another settings profile
      is loaded, it *still* defaults to "wide"
       
    25. Monstieur

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      Most of the modes have incorrect settings out of the box, thanks to the marketing department. It's a shame that the average TV buyer will never experience an accurate image.

      If you want to see truly accurate SDR and HDR, buy a G-SYNC HDR monitor like the Predator X27. It is perfectly preset for sRGB SDR and BT.2020 HDR. It uses static tone mapping from 0-1000 nits (no dynamic contrast nonsense), so the desktop and all applications look identical whether HDR is on or off, and you can use the PC with the monitor in HDR mode permanently switched on. Only the video area in say YouTube will be HDR, and the surrounding region is SDR at your selected "SDR content appearance" brightness level. You can view wide gamut images on websites seamlessly alongside sRGB images. Everything is mapped perfectly based on the content type while the display remains in HDR mode.
       
    26. davexnet

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      Yes you're probably right - thanks for monitor tip
       

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