Starting in 2016, mainstream TVs are beginning to be equipped with a technology called HDR. HDR is highly valued by manufacturers as a picture enhancement technology. HDR is the most important picture quality technology after 4K. What is the effect of HDR?
HDR on TV is different from HDR in video and games. HDR on TV refers to High Dynamic Range, which is a new video standard. It has a higher brightness range and high contrast. Previous shooting devices were unable to provide HDR content and lost important video information during video conversion, compression, and transmission, including brightness, saturation, and contrast.
In particular, the SDR specification itself limits the maximum brightness range of the video. In order to solve this problem, HDR is naturally born. The essence of HDR technology is two major features, namely a brighter, higher and color display range, high brightness can bring better contrast and color gamut, and a higher color gamut can also bring wider color rendering range. The emergence of HDR can be said to improve the overall picture quality, especially when used with 4K technology.
Frequently, you will see a similar picture in the TV introduction. On the left is the non-HDR (SDR) and on the right is the HDR picture. From this picture, you can see that the SDR picture on the left looks a little grey and right. HDR image quality, you can see the HDR screen in the brightness, color effects are far beyond the SDR. Is that really the case? Let's take a look at the actual picture effect
This is a photograph of a shop along the street. From the photos, it is not difficult to find that the style of the photo is the familiar color effect. There is no excessive modification and the screen is slightly grayish.
After HDR image acquisition and output, the overall brightness of the screen has been improved, the colors of cabinets, walls and people have significantly improved, and the brightness outside the window has also been greatly improved, giving a high dynamic range effect.
Similarly, this is a HDR demo film real shot, in which the girls' effects on different televisions are completely different, and the images displayed on non-HDR TVs are still gray and dull.
In the HDR TV, the brightness and contrast are improved, the screen is transparent, and even the outdoor light is more realistic.
Through this contrast, you can see the power of HDR more intuitively. The left SDR signal can clearly see all the contents inside and outside the car, but the screen still appears gray. The right HDR display is enhanced in all aspects of brightness, contrast, and saturation. The dark part of the compartment is darker and the clothes are brighter. The scenery outside the window shows that the trees are greener and the vision is brighter. This is consistent with the effect of the human eye looking outside in the dark.
Compared with SRD, HDR can avoid the high light overflow under the BT.709 color gamut standard and solve the problem of insufficient dark areas. Simply put, in short, SDR-to-HDR changes, regardless of the processing technology, but the upper limit of the brightness normally displayed in the original image information is greatly increased. If 1080P to 4K are resolution upgrades, then HDR is a big upgrade in brightness, color gamut, contrast, and color range. It's no wonder that manufacturers are focusing on HDR.
It can be seen that the HDR effect is very good, but there are still some problems with HDR at this stage. The main ones are the mainstream specifications of Dolby Vision and HDR10. Most entry-level TVs choose HDR10, because they are cheap and they do not pick the source. The Dolby Vision starts from the source and can perform frame-by-frame rendering of the picture, so it works best.
On the other hand, the higher the HDR TV brightness is, the higher the backlight brightness is, the higher the color gamut is. On the other hand, the high dynamic range also needs the support of high brightness. In this regard, Sony, Samsung, Skyworth, Hisense, etc. have more than 1,000 nits of highlight models to choose from.
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