R.Masciola's HDR-10 UHD Test Patterns - Page 62 - AVS Forum | Home Theater Discussions And Reviews
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post #1831 of 1833 Old 09-05-2019, 05:41 AM
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Quote:
Originally Posted by mombasa123 View Post
Thank you Ryan. That is v informative and educational!

I think the correct Contrast for the Q9FN is 45 based on EOTF/Luminance curves (in preference to the clipping patterns). Vincent Teoh also pointed out the blownup highlights (ie loss of detail) in his review (default Contrast of 50). I have attached both 45 & 50 Contrast curves to illustrate. The 45 one is much closer to reference and inline with rtings.com post review analysis.

It has been all over the net that Samsung do artificially brighten the PQ so your comments do fit. I am not convinced that Samsung do not respect MaxCLL/FLL as my Vero 4K+ which (currently) does noy pass that metadata has very different clipping readings compared to the internal player. My Odroid N2 and Oppo based M9702 media streamer arriving soon so looking fwd to some comparisions.

Many thanks again for replying.
The contrast will actually be between 40-45 to correctly follow the EOTF. Just depends on your panel.

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post #1832 of 1833 Old 09-05-2019, 06:10 AM
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Quote:
Originally Posted by mombasa123 View Post
I think the correct Contrast for the Q9FN is 45 based on EOTF/Luminance curves (in preference to the clipping patterns)
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Originally Posted by jrref View Post
The contrast will actually be between 40-45 to correctly follow the EOTF. Just depends on your panel.
At 50% input the PQ curve target is 94.4 nits. In this particular case, at 50% input Contrast 50 produced 201 nits, Contrast 45 produced 161 nits, so 40 may be closer to target.
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Last edited by Dominic Chan; 09-05-2019 at 11:22 AM.
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post #1833 of 1833 Old 09-05-2019, 08:14 PM
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Agreed with both of you - I need to drop Contrast a notch at a time and check.

However, I believe it also depends on the what nits the material is mastered at according to rtings.com. 4k nits requires a higher contrast setting than 1k nits so a compromise in inevitable

Update 05/24/2018: HDTVTest has shown that for lower brightness HDR infoframes (such as 1000 nits) the TV produces scenes which are brighter than intended (see his video here). You can see more about this in the Additional review notes.

https://www.rtings.com/tv/discussion...l-review-notes

Edit : actually looking at the rtings.com charts, I think I will stick to 45 Contrast (or maybe even a lil higher) as 4k material will be a bit dim otherwise. Prefer a brighter pic (who doesn't?).

Edit : Regardless, Ryan's patterns have been invaluable in figuring out the correct (!) setting and what's going on. PS @mascior , any chance of grayscale patches mastered a 4k nits ?

Edit : nvm - think I have found grayscale patches at different nit levels.
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Last edited by mombasa123; 09-06-2019 at 09:32 AM.
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