Sky Q 2tb when using HDR 10 bit my Samsung screen dims

[wrdsimon]

Sky Q 2tb box set to 10 bit HDR screen dims Samsung engineer says this is because my signal is 70 and should be 100- works fine on 8bit

[Chodley]

Some engineer

Most likely it's because the max brightness of the screen isn't high enough. So the much increased range of contrast from the content (all of which is at the bright end of the scale) has to get squeezed into a range of brightness the screen cannt stretch to, so the average brightness of the image is brought down to avoid clipping at the brightest parts of the image.

which model is it?

and you say HDR10 but this effect is usually much worse with HLG. Have you tried content in both?

[wrdsimon]

UE75CU8000

it works fine when set to 8bit

but when you go to 10bit it goes dim

brightness on tv set to full(50)

Samsung did a live chat with me yesterday they say it's because my sky signal strength is 70 and should be 100?

thank you 

[oldfella]

---

@wrdsimon wrote:

UE75CU8000

it works fine when set to 8bit

but when you go to 10bit it goes dim

brightness on tv set to full(50)

Samsung did a live chat with me yesterday they say it's because my sky signal strength is 70 and should be 100?

thank you 

---

Nothing to do with your signal strength @wrdsimon 

As noted by @Chodley 

Your Television Peak brightness is not sufficient enough to best display 10 bit HDR

[wrdsimon]

Ok thanks for the info 

[oldfella]

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@wrdsimon wrote:

Ok thanks for the info 

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Just to confirm @wrdsimon 

Following quote 

"When it comes to brightness, the CU8000 supports HDR10, HLG and HDR10+, but the brightness is a little too low for a really spectacular HDR experience. The maximum peak brightness in HDR goes up to around 320 nits, which is a bit disappointing."

You really need at least 600 nits to get any benefit from HDR

[wrdsimon]

Cheers - my old Samsung tv was a 7000 and that worked perfect so as you say disappointing 

thanks again 

[nigea99]

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@wrdsimon wrote:

UE75CU8000

it works fine when set to 8bit

but when you go to 10bit it goes dim

brightness on tv set to full(50)

Samsung did a live chat with me yesterday they say it's because my sky signal strength is 70 and should be 100?

thank you 

---

@wrdsimon 

the others have explained regarding the need for a peak brightness of around 600 nits and above to work with HLG HDR

It is such a shame that Samsung Tech support

a) did not know this and explain this could be the reason

&

b) clearly have no knowledge of Satellite Stregth & quality 

[PandJ2020]

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@nigea99 wrote:

b) clearly have no knowledge of Satellite Stregth & quality 

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It's always easier to 'blame' the other company - it often seems a common tactic with most tech support...   (And often gets into a situation where they blame each other)

[wrdsimon]

I wonder why the older 7000 worked ok ? 

basically same tv just a 2020 model this I've had a month apparently 2023 model

[wrdsimon]

I know mad isn't it - anyway 8bit will be fine my eyes 👀 are not that sophisticated to pick up the difference- thanks for all your help 

[cuke]

Trouble is it is down to Sky to resolve because their implementation of HLG is wanting to say the least. I can watch HLG content on the tv's own bbc iplayer on my 2024 S95D and in filmmaker mode it is bright enough. However with any Sky HLG content I have to adjust the tv's picture settings so as it is bright enough.

[Chodley]

---

@cuke wrote:

Trouble is it is down to Sky to resolve because their implementation of HLG is wanting to say the least. I can watch HLG content on the tv's own bbc iplayer on my 2024 S95D and in filmmaker mode it is bright enough. However with any Sky HLG content I have to adjust the tv's picture settings so as it is bright enough.

---

Brightness should always be on max on any HDR content

[Chodley]

---

@wrdsimon wrote:

UE75CU8000

it works fine when set to 8bit

but when you go to 10bit it goes dim

brightness on tv set to full(50)

Samsung did a live chat with me yesterday they say it's because my sky signal strength is 70 and should be 100?

thank you 

---

Yeah. Imagine the brightest white pixel that can be described is 4x as bright with a 10bit image vs an 8bit image (simplification but it kind of doubles with each extra "bit" of colour info)

now if the TV's physical tech cannot display something 4 times as brightly, it squashes all the other pixels' brightnesses down so that the contrast expected from that brightest part of the image still relatively stands out as much as it should. This is why screens need to be capable of much higher light output to do HDR well and for HLG in particular because of how it's designed to still work simultaneously on an SDR screen, the effect is even worse.

The Samsung 7000 probably just had higher peak brightness even though it was older.

Samsung need to hire better tech support people, or train them properly.

[wrdsimon]

I contacted Samsung again and the lady took control of my tv remotely and altered some settings she then played a clip from their end and it was perfect - so I'm more confused now than before - is it the sky box or is it Samsung ? She also looked at my tv picture through the camera on my phone and she said from her prospective it looked fine - so maybe it's me that needs to adjust maybe the older picture settings I've been watching are fake and enhanced and this one 10bit is correct ? Thanks for all the comments