came across this article, good.
detailed description on what is UHD for a display which is not just 4K.
of course, the best display can only be obtained with the highest specs of the TV, the player and the source.
q10pro is rated UHD - 4k, 60fps, 10bit, HDR10, ycbcr 444.
but is not dolby vision 12 bit (dolby not granting license yet).
i have played many files of such specs, no problem.
to get the max out of these advanced features, u not only need the player and the source, but a tv that is rated uhd 4k HDR.
Then we get more technical, and explain some of the aspects of UHD:
4K resolution
Wide color gamut
Color bit depth
Color subsampling
HDMI versions
HDCP
HDMI data rates
HDMI cables
Display certification standards
HDRWhat UHD Sources are there?
At this point a few hardware options:
UHD Blu Ray players, such as the new Samsung UBD-K8500. You can buy discs for around $30 from Amazon or Best Buy right now in the US!
Kaleidescape Strato – these players can download UHD content from the Kaleidescape store. The movies are created directly from master files received from the content creators and are not simple copies of UHD Blu Ray discs…in fact there is more UHD content on the store than there is currently UHD Blu Rays! The Strato supports HDR10 but not Dolby Vision, as well as the lossless audio codecs and Dolby Atmos.
Sony FMP-X10 player, which we believe is end-of-life and does not support HDR.
Kaleidescape Strato
Then there are the streaming services, which can be accessed from many hardware devices such as the those built into your TV, Roku 4K player, Amazon FireTV2, Nvidia Shield, etc.
Vudu
Netflix,
Amazon
Ultraflix
M-GO
YouTube
Sony’s forthcoming “Ultra” service
For a comprehensive list of sources and available content, see the “Master List of 4K“… thread over at AVSForum.com.
Note that most of the streaming services have compressed audio soundtracks, even the ones advertising Dolby Atmos like Vudu. Since high performance home theater is about video and audio, that only leaves two sources of note: UHD Blu Ray and Kaleidescape’s Store. For more read My Search for Higher-Quality Soundtracks in Streaming Movies.
What is the Ultra HD Blu Ray specification?
The Ultra HD Blu Ray spec is as follows (see the rest of this article for details on how to “decipher” these acronyms):
Up to 4K resolution
4:2:0 color sub-sampling
Up to 10 bit color
Up to 60 frames per second
Support for wide color gamuts (REC.2020)
Support for HDR10 and Dolby Vision
No 3D support
HDCP2.2
Ultra HD Blu Ray
As many of these specifications are optional it seems that just because a disc is labeled Ultra HD Blu Ray does not mean it will have HDR, a wide color gamut or 10 bit color. Hopefully UHD Blu Ray players will have some kind of signal information menu to reveal what is actually on the disc.
Note also that many of the movies announced for release on UHD Blu Ray so far were actually not shot at 4K resolution! See this article for some insightful analysis.
What capabilities does my display need to enjoy UHD content?
HDMI2.0 / HDCP2.2. First and foremost you need a display capable of receiving a HDMI2.0 / HDCP2.2 signal. Unfortunately for consumers some early TVs sold as 4K capable do not have the required HDMI2.0 / HDCP2.2 inputs!
4K resolution. UHD is 4x the resolution of HDTV, typically 3840×2160 (2160p), although the Sony PJs have slightly larger, since they use imaging chips derived from their cinema projectors.
Whilst not strictly necessary for UHD your display may also have:Wide color gamut (WCG). HDTV and Blu-Rays are mastered and distributed in the REC.709 color gamut. With UHD content can be distributed in either the REC.709 or REC.2020 color gamuts. If REC.2020 is used that does not necessarily mean the content has been created using such a wide color gamut. We expect most of the “wide color gamut” content for the next few years to actually have a color gamut similar to the commercial cinema P3 space. REC.2020 can, in this instance, be considered as the container, rather than necessarily the actual color gamut of the encoded content. With this being said, your display must accept a REC.2020 signal to display WCG content. Apparently some displays released to date such as the Sony VPL-VW1100ES do not accept REC.2020 even though they are marketed as being able to reproduce a color gamut approaching P3. Confusing, we know, but that is the state of things with respect to 4K / UHD in 2016!
High dynamic range (HDR). This is the ability to display images with highlights that are much brighter than today. These highlights are used for things like reflections off cars. Content has to be specifically mastered for HDR, so not all UHD content will necessarily be HDR. There are also at least three competing standards for HDR, including HDR10 and Dolby Vision and no broadcast standard. There’s also a new gamma curve (more correctly an electro-optical transfer function or EOTF), SMPTE ST2084. Whilst the UHD Alliance has mandated brightness standards for TVs there are no such standards for projectors. In addition whilst there is a mastering standard for HDR (1000 nit for HDR10) there is no standard or accepted practice for how to scale to the output levels that your display is capable of. Suffice to say it is early days for HDR!
Things there are confusion over with respect to UHD displays:
18Gbps. This may be required if content makers start releasing movies with high frame rates. 4K @ 60 frames per second may require 18Gbps data rates if it is at bit depths of 10 or 12 bits. Otherwise 10.2Gbps is fine, even for 4K60 at 8 bit!
12 bit color. This refers to the color bit-depth. Old Blu-Ray is 8 bit, new UHD Blu Ray can support 10 bit. It’s not clear what bit depth is being used by the streaming services, but it’s probably 8 bit.
4:4:4. This refers to color sub-sampling. Whilst 4:4:4 is used in content mastering, UHD is distributed via 4:2:0.
3D. There is no UHD 3D at this time, at least via Blu Ray.
http://www.acousticfrontiers.com/uhd-101-v2/
Oct 5 2017, 08:06 PM
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