What is a High Dynamic Range HDR TV? - Τι είναι μια τηλεόραση HDR υψηλού δυναμικού εύρους;

Returns of experience in HDR on UHD TV Edge LED, Full LED and OLED...http://www.hdfever.fr/2016/03/06/dossier-experiences-hdr10/

μετάφραση goolge fr to en

HDR-dolby.jpg

source:[hdfever.fr]
 
[hdtvtest.co.uk]...4K Blu-ray vs Blu-ray Reveals HDR Is Too Dim for Daytime...http://www.hdtvtest.co.uk/news/4k-vs-201604104279.htm

Summary

Let’s recap the problem in a nutshell: the HDR presentation in current Ultra HD Blu-ray films is not bright enough for viewing under moderate/ strong ambient lighting, because the HDR metadata forces compatible TVs to be driven at their maximum backlight capacity, leaving no room for higher light output. Of course, there exist other avenues (such as gamma adjustment or dynamic contrast trickery) to brighten the on-screen image for daytime viewing, but these are generally insubstantial compared with the most effective method of raising backlight luminance.

This issue is not confined to 4K Blu-ray – any HDR content that pushes backlight/ contrast to the limit for peak brightness while maintaining an SDR-like APL is going to suffer from the same problem. One potential solution is for manufacturers to provide the option to disable HDR mode either from the display or the Ultra HD BD player (so you’ll get 3840 x 2160 in SDR instead), but that would mean missing out on the most attractive component in the next wave of UHD (ultra high-definition) development.

Whilst it took the arrival of Ultra HD Blu-ray (so we could compare against standard Blu-ray) for us to spot the problem, it seems the video industry was already aware of this potential banana skin. A white paper titled “HDR/WCG Systems Survey: Emerging UHDTV Systems” published by leading calibration software developer SpectraCal here (email registration required to download) contains this illuminating snippet:

"For HDR, the industry is considering 5 nits (cd/m2) to be a desirable surround luminance level.

5 cd/m2 is very dark, roughly the amount of light generated by five lit candles; any switched-on room lamp is likely to exceed this figure. With its usage pretty much restricted to a dark room (not dissimilar to 3D if you think about it), 4K HDR Blu-ray is a niche format that may become even more niche, although in fairness most video enthusiasts would do their critical viewing in a dimly-lit environment anyway. It will be interesting to see if HDR broadcast can succeed in the average living room which is typically not light-controlled…​
 
[TABLE="class: cms_table_cms_table_cms_table_cms_table"]
[TR="bgcolor: #40e0d0"]
[TD]_______________________[/TD]
[TD]
Dolby Vision​
________________________________________________________[/TD]
[TD]
HDR 10
​
_____________________________________________________________[/TD]
[/TR]
[TR]
[TD]Type metadata processing[/TD]
[TD]Dynamic stop motion processing.[/TD]
[TD]Statistical set of metadata for each film transmits average and maximum brightness, but also the depth of the color palette.[/TD]
[/TR]
[TR="bgcolor: #F8F8F8"]
[TD]Adaptation under the display[/TD]
[TD]All material properties (brightness, color depth, brightness) adapt under capacity of the display.[/TD]
[TD]Single static set of metadata, not taking into account the capabilities of the display.[/TD]
[/TR]
[TR]
[TD]Compatibility with other types of HDR[/TD]
[TD]Televisions certified Dolby Vision, a condition compatible with HDR10.[/TD]
[TD]Playback capability only HDR content.[/TD]
[/TR]
[TR="bgcolor: #F8F8F8"]
[TD]Technology Versatility[/TD]
[TD]Common standard for television and theaters.
Applied to movies and games.[/TD]
[TD]Standard developed exclusively for TVs.[/TD]
[/TR]
[/TABLE]
 
In this special interview edition of the AVForums Podcast we speak to Stephen Auld from Dolby about High Dynamic Range and specifically Dolby Vision. Stephen explains what Dolby Vision is and how it works; he also talks about which displays support the format, where you can find content and why Dolby thinks it's the best version of HDR.

00:01:12 – What is Dolby Vision?
00:03:46 – How does Dolby Vision differ from HDR 10?

https://www.youtube.com/watch?v=jdlUcvfFxFA

source:[avforums.com]
 
[flatpanelshd.com]...ITU announces BT.2100 HDR TV standard...http://www.flatpanelshd.com/news.php?subaction=showfull&id=1467719709


ITU BT.2100 HDR TV Standard: 1000 Nits Peak Luminance...http://www.hdtvtest.co.uk/news/bt2100-201607104318.htm

bt2100.jpg


source:[hdtvtest.co.uk]

--- Αυτόματη συγχώνευση μηνύματος ---

Calibrating HDR

Scott Wilkinson talks with Florian Friedrich, video guru at Quality.TV, about calibrating HDR displays.

https://www.youtube.com/watch?v=4daSa-Jnqu4

source:[TWiTHomeTheaterGeeks]
 
παιδια στα φιλτρα του skroutz.gr εχει τις 2 εξης επιλογες 4K Super UHD (HDR) και 4Κ Ultra HD ποια η διαφορα τους? η πρωτη κατηγορια υποστηριζει hdr και δευτερη οχι
 
Πιθανώς αυτό να είναι το κριτήριο. Αλλά το ότι μία συσκευή είναι συμβατή με το HDR δεν σημαίνει αυτόματα ότι μπορεί να το απεικονίσει και σωστά...

Αυτή τη στιγμή τα μοντέλα τηλεοράσεων που μπορούν να απεικονίσουν ένα αξιοπρεπές HDR είναι μετρημένα στα δάχτυλα του ενός χεριού...
 
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