Hi, this is Wayne again with a topic “There’s ANOTHER Version of HDMI”.
Hdmi made the entire internet mad recently by introducing a confusing new branding scheme when the old one was serving everyone just fine but hold on there’s more because it’s about to get more confusing with the introduction of hdmi 2.1, a the there’s an a. So let’s talk about what’s new in the hdmi 2.1 a spec and as you may have gathered from the fact that it’s called 2.1 a instead of 2.2, the list of changes is rather short. In fact, there’s only one new feature and it’s called source based tone mapping that might sound like some kind of gimmick, you’d pay extra for at a tanning salon, but it actually has to do with the way devices handle hdr tone. Mapping is the process of taking hdr signal and adjusting it to match the capabilities of whichever display you happen to be watching that content on you see many hdr capable tvs actually are not able to show an hdr image as it’s originally mastered. Oftentimes.
The original video is mastered at a thousand nits of brightness or even higher, but most consumer displays even many that are marketed as hdr cannot get that bright. Additionally, hdr content is often mastered for a wider color gamut than many tvs can show, meaning they can’t display. As many colors, as are contained in the source material without tone mapping, the tv would clip the image that is, it would simply discard the information it can’t display from the video signal, and the image would instead have very incorrect, colors or just parts with no information And portions that would be blown out to absolute crap, so you can’t even see them at all so tone. Mapping effectively takes color and brightness information and maps it to a value that the tv can actually show.
This allows the tv to approximate the original image accurately enough so that it looks okay on your screen instead of a distorted mess. So, for example, a signal with 1000 nits peak brightness can be reduced so that the brightest parts of the image are now say: 400 nits. Everything just goes in line with that. Now, back to hdmi 2.1, a traditionally tone mapping is handled by the display itself, but the source-based tone, mapping and hdmi 2.1 a off-load some of this responsibility from the display and moves it to the source.
Whether the source is a gpu, a streaming box like an nvidia shield or a blu-ray player, but why exactly would we want this dolby vision? Hdr actually already has a proprietary option where you can select either tv led or player-led tone. Mapping and tests have shown that tone mapping looks better when it’s handled by the display itself, as the tv is adapting to its own characteristics, as well as data from its ambient light sensor. If it has one of those built in having the source handle tone, mapping means that it’s doing the mapping, based simply on what the tv reports, its capabilities to be meaning the adjustments the source makes, may not be as accurate. So why do we want this? Well, because there is a big plus to source based tone, mapping lower latency, even if something might look a bit better if the tv is handling the tone mapping. This additional processing that the tv has to do adds latency, which can be a significant drawback for gamers, who want, as small of a delay between pressing a button on the controller and seeing an action happen on the screen as possible. So source-based tone, mapping or sbtm is a sensible addition to hdmi’s, increasingly gamer-focused feature set additionally source-based tone. Mapping does allow more of a plug-and-play experience for the user as since it allows the source to read and understand the display’s capability. The user won’t have to spend as much time adjusting picture settings to get their hdr content.
To look right. For now it sounds like sbtm. Support can be added to existing devices via firmware updates, but that’ll be up to device manufacturers. So if you want the feature without spending extra on new equipment, your mileage may vary as av manufacturers have a track record, let’s say of being very slow with updates.
Additionally, hdmi 2.1a is going to suffer from the same stupid naming issues we saw with the original hdmi 2.1. All current hdmi devices will transition over to the hdmi 2.1 a name, but they don’t all have to support every new feature of hdmi, 2.1 or 2.1. A so make sure you read the spec sheet to see if the features you care about are actually present. I mean you never spend money without reading the fine print first right right, big thanks to freshbooks for sponsoring today’s video freshbooks is easy to use accounting software that helps you do your business.
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