HDR stands for High Dynamic Range and it can be said that it is the next leap in television technology. This term first appeared in the photography world, referring to a technique that can improve the dynamic range of a photograph—that is, the contrast between the brightest white and the darkest black.
This technique is based on a theory that the higher the dynamic range, the closer the picture is to reality. HDR on TV is based on the same theory. The most commonly cited example is Baiyun. You can tell different brightness levels when you look at it, but on television it seems to be less structured.
The reason why HDR technology is so good is that the dynamic range of TV is limited. It can't show the difference in brightness to the greatest degree. This means that you may lose many details when you look at the screen. After all, The information that your eyes can tell is much more than TV can present. In order to cater to the technical limitations of the TV itself, the displayed screen will be processed and the amount of information will be greatly reduced.
And now TV performance is more powerful than before. In terms of brightness, an ordinary TV has a brightness range of only 100 nits to 300 nits, but now an HDR TV can theoretically reach 5000 nits. Of course, the high brightness is only a theoretical value, and its purpose is only to expand the scope to show more content.
The whole purpose of HDR is to let you see more of the image. You can see more details in either the highlights or the shadows. Therefore, the color will be more abundant and realistic, and the gradient on the human face will be more delicate and realistic. In a word, the HDR technology TV picture will be more natural and vivid.
It should be noted that HDR and UHD are not the same thing at all, although they are often mentioned together and there are two identical letters. UHD is also what we often call 4K, aiming to significantly increase the resolution of the TV (compared to the current 1080p). Some people think that HDR is more important than UHD in improving image quality. The latter raises the resolution just to make the picture more detailed. Actually 1080p picture is not bad at a certain distance. HDR is to let the picture be able to There is a full range of improvements.
However, HDR technology is not free to enjoy when you buy a TV that supports it. To experience the advancement of HDR technology, you also need to support the content of this standard, whether it be a Blu-ray movie or an online video. Although major service providers have already had the intention to promote it, it will take a long time to popularize HDR content.
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