HDR is the high dynamic range and it is the latest technology in 4k LED TVs and 4k content. This term originates in photography and refers to the fact the higher the dynamic range the closer and real picture looks. It is the same in the case of TV.
We all have heard this term of HDR in the TV world. But do we actually know what this means? It is developed to enhance the experience of watching TV. HDR TV can achieve more bright colors and highlight them.
What is High Dynamic Range?
The two main factors in a TV display are the contrast ratio and color accuracy. Color accuracy is simply how real the colors that are showing on TV looks. The contrast ratio, on the other hand, means how bright and how dark a TV can get.
The purpose of HDR is to maintain the balance between both of them and put the best result by their combination. The bright becomes more bright with HDR, it happens with all colors like green becomes greener, red becomes redder. Basically it puts more depth in the colors and contrast ration of LED TV.
WCG ( Wide Color Gamut ) also works with HDR. with the help of WCG on TV, we are now able to see those colors which were impossible to produce on TV earlier. Like the difference between all the greens of street and different, all kinds of red.
How do HDR works?
The working of HDR consists of the two-way path. First, you need to have a TV which produces more light as compared to the normal tv. That bright light should be tied to the HDR or WCG.
TVs with HDR can produce much more clear video quality as compared to blue-ray DVDs. But many companies make HDR TVs it does not mean the quality of all of them is the same. Some can produce more dynamic video quality than others.
If there is a label of HDR on a TV it means that TV is capable of showing users the HDR picture quality. But it does not mention how well it can display you.
The second aspect of this is the content part, the availability of content in 4k quality content. Now the HDR content is available and people have started producing it in a large number. Video streaming platforms like Netflix, Amazon Prime are the example of this.
Different versions of HDR-
HDR10 is the version that is supported by everything and has the potential to produce better quality than SDR, but it is not as good as Dobly vision and HDR10+. HDR uses the 10-bit color depth which provides us to produce millions of colors, which is more than the 8-bit color depth which was provided by the SDR.
HDR10 provides for a maximum of 1000 nits. This is the drawback of HSR 10 as we know the brightest HDR TVs are capable of producing much more nits than just 1000.
Dolby Vision supports 12-bit color and up to 10000 nits. It means it is better than HDR 10 in many ways. It is supported widely all over the world and potentially produces the best picture quality. The only issue is they have less stock of content on this display.
Another issue with DV is companies have to pay Dolby to use. After paying Dolby the money, Dolby shows the companies the difference of using it on their tv. So for many companies, it is difficult to pay Dolby as they also have to maintain the price to be in the market competition.
HDR 10+ is used by some companies in order not to pay the amount of licensing to Dolby’s vision. The companies like Samsung, Panasonic, Philips are some that are using this technology.
HDR 10+ allows users to use dynamic metadata to use in TV and 10-bit color depth with a combination of 4000 nits. It is mainly used by companies to provide content creators such a quality that people can use and the companies do not have to pay for licensing.
Amazon fire tv stick is one of the rear devices that supports this content. Basically it is not supported widely.
Mainly there are two HDR types HDR and Dolby Vision. But there are some other companies like BBC & NHK, developed Hybrid Log-Gamma (HLG) with the emphasis on live broadcasting, it can also be used for preloaded content. HDR by technicolor aims to be compatible with old SDR, which will be able to send signals to their customers regardless of which TV they are using.
Mobile HDR & TV HDR-
Most of the people often believe that mobile HDR of photo and the HDR of TV is the same. But these two are very different terms. In the mobile HDR of the photo, several photos are taken at different light exposures. The purpose of this to have a better image with bright, light or dark colors.
In TV HDR you have the access of WCG and HDR in your display but they are not used by capturing several images.