Colors that, so far, were impossible to reproduce on any television.
Wide color gamut (WCG) is along for the ride with HDR, and that brings even more colors to the table. Bright parts of the image can get much brighter, so the image seems to have more "depth." Colors get expanded to show more bright blues, greens, reds and everything in between. HDR expands the range of both contrast and color significantly.
Ultra HD 4K TV color, part I: Red, green, blue and beyond. LG OLED: How the two best TV technologies compare Dolby Vision, HDR10, Technicolor and HLG: HDR formats explained. It will look more natural, "pop" more and just seem more "real," despite having lower resolution. If you put two TVs side by side, one with a better contrast ratio and more accurate color, and the other with just a higher resolution (more pixels ( $603 at Amazon)), the one with greater contrast ratio will be picked by pretty much every viewer. This isn't just my opinion, but also that of nearly every other TV reviewer, people who have participated in multi-TV face-offs at stores and for websites/magazines, and industry experts like the Imaging Science Foundation. The two most important factors in how a TV looks are contrast ratio, or how bright and dark the TV can get, and color accuracy, which is basically how closely colors on the screen resemble real life (or whatever palette the director intends). There are numerous HDR formats, including "generic" HDR (aka HDR10), Dolby Vision, HDR10+ and more. Almost all HDR content today is also available in 4K resolution. With some budget TVs, HDR can even look worse than non-HDR. HDR on a budget HDR TV and HDR on an expensive HDR TV can look very different. Many HDR TVs also have wide color gamut, resulting in deeper, richer colors with content that supports it. HDR images can achieve brighter highlights with more contrast. HDR requires both a TV that supports it and special HDR content, which is widely available on many streaming services as well as PlayStation and Xbox games. Here are some highlights before we dive in: There are important caveats to consider when you're buying a new TV, and even after you've gotten your HDR TV home and set up. 
So is HDR worth the hype? In two words: largely, yes. And just because a TV is labeled "4K HDR" doesn't mean you'll get any increase in performance. On a good-quality TV displaying real HDR TV shows, movies and games, you'll see brighter highlights, better contrast and deeper, more realistic colors. It's found on nearly all of the best TVs, including midrange and high-end TVs as well as many budget models. HDR, or high-dynamic range, can elevate the image of your TV to an entirely new level.
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