浏览电视过道(TV aisle)，您会注意到其描述中使用的各种首字母缩略词。超高清(Ultra HD)、超高清、2160p(UHD)、4K x 2K、4K超高清(Ultra High Definition)、四倍高清(Quad High Definition)、四倍分辨率(Quad Resolution)、四倍全高清(Quad Full High Definition)、QFHD、UD、HDR……(HDR…the list)不胜枚举。额外的钱值得炒作吗？
4K/UHD 的像素数是 1080p 的四倍，所以肯定更好吧？不完全是。只有在近距离观看(viewing distance)或者电影或图像(movie or image)是原生 4K 内容时，您才能看到质量的变化。
在原生 4K 下，4K 无法改善任何图像，因此低于 4K 的任何图像都不会显示任何改善。HDR（高动态范围）不像 4K 那样专注于添加更多像素，而是通过提高对比度和亮度(contrast and brightness)并提供更广泛(wider range)的颜色来创建更好、更动态的像素。
误导
对于一些尚未实现实际“ HDR体验”的制造商来说，一个常见的说法是使用“ (HDR)HDR -capable”或“ HDR -compatible”这样的短语(phrase “)来误导客户。虽然名称中有HDR，但这并不意味着它可以产生同样高质量、彩色的HDR 图像(HDR image)。这些电视只能读取HDR元数据，这是编码成信号的数据，告诉电视如何显示图像。
这些电视(TVs)的一大挑战是亮度。具有HDR(HDR)的顶级品牌电视可以达到 500-1,000 尼特（亮度的测量单位）。支持HDR的(HDR)电视(TVs)支持100-300尼特，其结果是色彩范围更加有限。
目前基本上有两种类型的HDR技术(HDR technology)。HDR10已被用作几乎所有具有HDR的电视的(HDR)基准标准(baseline standard)。如果您有超高清蓝光播放器(Ultra HD Blu-ray player)，那么这是唯一支持的格式。您的另一个选择是增强版HDR10，称为杜比视界(Dolby Vision)。
什么是杜比视界？
杜比(Dolby)公司也以杜比环绕声(Dolby Surround)而闻名，它为HDR 4K创建了一个名为杜比视界的(Dolby Vision)品牌名称(brand name)。制造商必须对他们的设备进行测试并付费才能让他们的产品获得认证，以便在他们的设备上贴上杜比视界标志。(Dolby Vision logo)杜比 HDR 格式(Dolby HDR format)也广泛用于专业电影行业(film industry)。
杜比视界(Dolby Vision)提供了更具体的兼容性说明。杜比(Dolby)甚至对特定电影制作、广播电视和电视显示器上的杜比视界 HDR 素材(Dolby Vision HDR material)进行编码和解码的单独说明。这使得它比HDR10在技术上的要求更高。
那么HDR10还是杜比视界？
杜比视界电视(Dolby Vision TVs)应该会产生更好的视觉体验，但话虽如此，并非所有电视都是平等的。这些电视提供(TVs provide)可以改变场景的元数据，指示电视提高对比度或增强某些颜色。杜比视界可以在(Dolby Vision)亮度范围内(brightness scale)为可能的 680 亿种颜色执行高达 12 位的色深(color depth)，达到 4,000 尼特或更高。
HDR10使用一组固定的元数据，从而降低了电视制作不同电影和场景的方式的灵活性。HDR10也仅限于 10 位色深(color depth)，最多可显示 10.7 亿种颜色。与杜比视界电视(Dolby Vision TVs)相比，它可能缺乏亮度水平，仅允许 1,000 尼特或更高。
现在，杜比视界(Dolby Vision)似乎是合乎逻辑的赢家，对吧？好吧，到目前为止，没有任何消费类电视能够支持 12 位色深(color depth)。杜比视界系列(Dolby Visions range)有望成为未来产品的伏笔。
即使在亮度要求上，杜比和 HDR10 格式(Dolby and HDR10 formats)也可能会出现偏差。这方面的一个例子是OLED装置，它无法达到LCD的亮度水平，但在涉及较低光水平时可以提供卓越的体验。但是，这两款电视都符合(TVs qualify)HDR10和杜比视界(HDR10 and Dolby vision)兼容的标准。
切入正题！
因此，无论(Whether)您是想了解这两种电视的(TVs)知识和细节(knowledge and specifics)，还是只是滚动到底部以获得简单的答案，我们都有坏消息要告诉您：没有简单的答案。答案取决于你的情况。
如果您有一个光线昏暗的指定房间和支持HDR的设备，并且您离电视有点近，那么HDR适合您。另一方面，如果您只看有线电视并且没有在HDR 机器(HDR machine)上花费额外的一分钱，那么 4K 就可以了。
4K vs HDR vs Dolby Vision: What’s the Best for Your TV?
Browsing through the TV aislе, you notice the wide variety of acronyms used in their descriptions. Ultra HD, UHD, 2160p, 4K x 2K, 4K Ultra High Definition, Quad High Definition, Quad Resolution, Quad Full High Definition, QFHD, UD, HDR…the list goes оn. Is the extra money worth the hype?
4K/UHD has four times the number of pixels as 1080p, so it must be better, right? Not exactly. You may only see the change in quality if you’re at a close viewing distance or if the movie or image is native 4K content.
4K can’t improve any image under native 4K, so anything less than 4K will show no improvement. HDR (high dynamic range) doesn’t focus on adding more pixels like its 4K counterpart, but instead creates better, more dynamic pixels by boosting contrast and brightness and providing a wider range of colors.
Misdirection
A common pitch for some manufacturers who haven’t achieved the actual “HDR experience” have misdirected customers by using the phrase “HDR-capable”, or “HDR-compatible.” Although it has HDR in the name, it doesn’t mean that it can produce the same high quality, colorful HDR image. These TV’s can only read HDR metadata, which is the data encoded into the signal that tells the TV how the image is to be shown.
A big challenge for these TVs is the brightness. Top brand televisions with HDR can hit 500-1,000 nits (the unit of measurement for brightness). HDR-capable TVs support 100-300 nits, the result of which is a much more limited range of color.
There are basically two types of HDR technology currently. HDR10 has been adopted as the baseline standard for almost every TV with HDR. If you have an Ultra HD Blu-ray player, then this is the only format supported. Your other choice is an enhanced version of HDR10, known as Dolby Vision.
What Is Dolby Vision?
Dolby, the company that’s also known for Dolby Surround, has created a brand name for HDR 4K known as Dolby Vision. Manufacturers must have their equipment tested and pay to get their products certified to have the Dolby Vision logo put on their devices. The Dolby HDR format is also widely used in the professional film industry.
Dolby Vision lays out more specific instructions for compatibility. Dolby even has separate instructions for encoding and decoding Dolby Vision HDR material on specific movie productions, broadcast TV, and TV displays. This makes it much more technologically demanding than HDR10.
So HDR10 or Dolby Vision?
Dolby Vision TVs should produce an even better visual experience, but with that being said, not all TVs are created equal. These TVs provide for metadata that can change scene to scene, instructing the TV to push contrast or boost certain colors. Dolby Vision can perform up to 12-bit color depth for a possible 68 billion colors on the brightness scale, reaching up to 4,000 nits or more.
HDR10 uses a fixed set of metadata, giving less flexibility on the way your TV can produce different movies and scenes. HDR10 is also limited to 10-bit color depth for up to 1.07 billion colors. It can lack in its brightness levels when comparing it to Dolby Vision TVs, only allowing for 1,000 nits or more.
Now, Dolby Vision seems like the logical winner, right? Well, as of now, no consumer TVs are even capable of a 12-bit color depth. Dolby Visions range is hopefully a foreshadowing of future products.
Even on brightness requirements, both Dolby and HDR10 formats can be skewed. An example of this is OLED sets which can’t reach the brightness levels of LCD but can offer a superior experience when concerning lower light levels. However, both TVs qualify as HDR10 and Dolby vision compatible sets.
Get to The Point!
So, Whether you wanted the knowledge and specifics over these two types of TVs, or you just scrolled to the bottom to get the simple answer, we have bad news for you: there is no simple answer. The answer is determined by your situation.
If you have a designated room with low lighting and an HDR-capable device, and you’re somewhat close to your TV, then HDR is for you. On the flip side, if you only watch cable and haven’t spent that extra penny on an HDR machine, 4K will do just fine.
