Gamma 2.4 ?

[Vincent]

If 2.4 gamma sdr is for dark rooms, then how do you watch hdr movies with gamma st.2084 which is almost like a 2.2 relative gamma…

Because they are encoded that way?

[Ben]

Menelaos, you have a very smooth greyscale going up in gamma very little.   It is good and I agreed with Vincent.     If you like you can try a higher quality setting and see what gamma it gives for the top 10%.

Others   its a .07 cd m2 rounded difference at 5%.  HCFR 100 brightness and .1 blackpoint.    How do I get .206 cdm2 at 5% when 0% is 0.273 cdm2 in blue and red and green is .101cdm2 ?   I go by eyes in a greyscale pattern in black level to set blue RGB 5%.  I try to follow Displaycal and it sets 5%  RGB Red to 0.287, Green to 0.279 and Blue is 0.394.   It looks better than defaults and grey scale in black levels has no tints.

[Old Man]

There is a standard for SDR. It’s BT.1886. Which is basically 2.4. The standard also calls for a dim (5-nit) environment. If you’re watching in a bright environment, you should use 2.2. But if you’re a professional colorist working in a grading suite (5-nit), you use 2.4. It’s the standard

[S Simeonov]

BT.1886 is 2.4 if the black level is 0, then and only then it will be 2.4. BT.1886 on ips panel with 1000:1 is very close to 2.2 gamma.

[Old Man]

Yes, BT.1886 is *exactly* 2.4 only when the display is capable of true black. That’s why I said, “basically.” But it is always based on 2.4.  The only difference is it rises out of black faster on other displays. It is never “close to 2.2 gamma.” Read the standard

[Author]

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