不久前，许多人都对高清电视着迷，它承诺为我们的电视观看体验带来非凡的清晰度。许多人开始淘汰传统的阴极射线管电视并带来纯平全高清 1080p(HD 1080p)电视。但是，既然这个世界唯一不变的就是变化，那么全高清电视的霸主地位就要结束了，但谁来负责呢？这是 4K 电视的日益普及。谈到电视分辨率，我们大多数人都会对4K、HDR和杜比视界(Dolby Vision)等热门术语感到困惑。它们之间有什么区别？本文包含您需要了解的有关 4K、HDR和杜比视界(Dolby Vision)的所有信息。
好画质的成分
就电视硬件而言，“分辨率”是指构成电视画面的像素数。单个像素或离散图片元素在屏幕上包含微小的点。
今天，在平板电视(TVs)上发现了丰富的分辨率。较旧的电视机和今天销售的许多 32 英寸型号都有大约一百万像素 (720p)。较新的和稍大的电视(TVs)（通常为 49 英寸或更小）的像素略高于 200 万像素 (1080p)。即使是最新的更大电视(TVs)（通常为 50 英寸及以上）也有 800 万台（用于 4K超高清(Ultra HD)）。您可能需要寻找放大镜来区分它们。
分辨率是用于销售电视(TVs)的最常见规格，但它并不是获得出色画质的最重要因素。高动态范围 ( HDR ) 性能、整体对比度和色彩都对图像质量起着重要作用。
什么是4K分辨率
您在电视屏幕上观看的图像的清晰度（无论其大小）在很大程度上取决于其分辨率。分辨率数字表示您的电视屏幕有多少像素或微小的“彩色点”。数字越高，显示越生动。我们的例子是“4K”，虽然全高清电视提供 1,920 X 1080 像素，但 4K 提供的分辨率是传统(HD TVs)高清电视(HD TVs)的四倍。
4K 电视以 1.78:1 的纵横比（通常称为 16×9）显示 3,840（大约 4K）水平像素和 2,160 垂直像素。像素总数为 8,294,400（约 8 兆像素）。很明显，在高清和 4K 之间，后者有望提供更清晰和更详细的显示。
HDR（高动态范围）与 4K
4K 和HDR都可以提高视频质量，但方式不同。HDR代表 High Dynamic Range，它不同于分辨率。它是一种增强的画质技术，可以在播放HDR(HDR)兼容内容时显示更逼真的色彩以及更高的亮度和对比度。
在支持HDR(HDR)的电视上观看HDR编码的视频源可以提供更广泛的图像对比度——最深的黑色和最亮的白色之间的差异清晰可见。HDR还可以确保您的电视色彩显得更加生动和准确。
与 4K 相比，HDR的图像增强效果非常显着，而且更容易察觉。但同样，尽管所有 4K 电视都可以识别不同的HDR图像数据，但许多电视无法提供完整的效果。
并非所有具有HDR的电视都是一样的
良好的HDR性能需要电视屏幕具备两个条件：
- 变得非常明亮的能力
- 显示深黑色的能力
这被称为“峰值亮度”，以“尼特”为单位。今天，即使几乎所有现代 4K 电视都采用了HDR技术，但廉价的电视在上述两个领域都缺乏局部调光功能。(HDR)然而，中高端LED-LCD 电视(LED-LCD TVs)和OLED型号在展示HDR优势方面表现出色。
什么是杜比视界
比较 4K 电视时，通常会遇到四种不同的HDR格式，包括HDR10、HLG（混合对数伽玛(Hybrid Log-Gamma)）、Technicolor® 的高级(Technicolor®)HDR(Advanced HDR)和杜比视界™(Dolby Vision™)。其中，HDR10和杜比视界(Dolby Vision)是最重要的格式。
HDR10是最常见的HDR格式，是超高清蓝光(Ultra HD Blu-ray)光盘的强制要求。杜比视界(Dolby Vision)适用于Netflix和亚马逊(Amazon)的流媒体内容，以及部分超高清蓝光(Ultra HD Blu-ray)影片。与HDR10相比，(HDR10)杜比视界(Dolby Vision)的最大优势是在核心HDR图像数据中添加了动态元数据。这(Which)意味着，HDR元数据可以告诉电视逐个场景甚至逐帧更改亮度范围。最令人印象深刻的部分是，内容以 12 位色彩和 4000 尼特的峰值亮度进行处理——值得注意的是，目前没有任何电视可以完全再现这些范围。
简而言之，杜比视界(Dolby Vision)是喷气发动机的燃料，它为世界上最好看的内容提供动力。越来越多的工作室正在转向这种格式，并将其潜力结合起来，在逐个场景的基础上提供彩色、动态和经过计算的图像。
杜比视界(Dolby Vision)vs. HDR vs. 4K – 底线
杜比视界(Dolby Vision one)是电视中最具颠覆性的进步之一。毫无疑问，4K 为我们提供了这些额外的像素，但正是HDR让这些像素以前所未有的方式闪耀。最终，所有这些都会出现在您的电视上。
4K vs HDR vs Dolby Vision: What to choose for the best experience?
It wаsn’t too long agо when many people were going crazy over HD televisions which promised tо bring exceptional clarity to our TV viewing experience. Many started scraping the cоnventional cathode ray tube TV’ѕ and brought flat screen full HD 1080p TV. But, since the only constant thing in this wоrld is change, the аscendency of full HD ΤV is coming to an end, but who’s to blame? It’s the іncreasing popularity of 4K TVs. When it comes to TV resolution, most of us get confused between trendіng terms likе 4K, HDR, and Dolby Vision. What is the difference between them? This article is packed with all the things you need to know about 4K vs. HDR vs. Dolby Vision.
Ingredients of good picture quality
In terms of TV hardware, ‘Resolution’ refers to the number of pixels which composes the picture on the TV. A single pixel, or discrete picture element, contains tiny dots on the screen.
Today, there are abundant resolutions found on flat-panel TVs. Older televisions and many 32-inch models sold today have a million or so pixels (720p). More recent and slightly bigger TVs (typically 49 inches and smaller) have a little more than 2 million pixels (1080p). Even the latest bigger TVs (typically 50 inches and above) have 8 million (for 4K Ultra HD). You might have to look for a magnifying glass to distinguish between them.
Resolution is the most common specification used to sell TVs, but it isn’t the single most ingredient for great picture quality. High dynamic range (HDR) performance, overall contrast ratio, and colors all play a big role in picture quality.
What is 4K resolution
The clarity of the image you are viewing on your TV screen, irrespective of its size, depends largely on its resolution. The resolution numbers indicate how many pixels or tiny ‘colored dots’ make up your TV screen. The higher the number, the more vivid the display will be. Our case in point is ‘4K’, while the full HD TVs offer 1,920 X 1080 pixels, 4Ks offers a resolution that is four times better than the conventional HD TVs.
A 4K TV displays 3,840 (which is around 4K) horizontal and 2,160 vertical pixels in a 1.78:1 aspect ratio (more normally referred to as 16×9). The total number of pixels is 8,294,400 (around 8 megapixels). It’s quite clear, between HD and 4K, the latter is expected to deliver more defined and detailed display.
HDR (High Dynamic Range) vs. 4K
4K and HDR both improve video quality, but not in the same way. HDR stands for High Dynamic Range, which is different than resolution. It is an enhanced picture quality technology that can display more life-like colors as well as higher brightness and contrast levels while playing HDR-compatible content.
Watching HDR-encoded video sources on an HDR-capable TV can provide a much wider range of picture contrast — the difference between the deepest blacks and the brightest whites is clearly visible. HDR also ensures your TV colors appear more vivid and accurate.
When compared to 4K, HDR’s picture enhancements can be dramatic, and much more perceptible. But again, although all 4K televisions can recognize the distinct HDR picture data, many can’t deliver the full impact.
Not all TVs with HDR are created equal
Good HDR performance demands two things from a TV screen:
- Ability to get very bright
- Ability to display deep blacks
This is referred to as ‘Peak Brightness’ and is measured in ‘Nits’. Today, even when HDR technology is found on virtually all modern 4K televisions, the inexpensive ones lack local dimming’s in both the areas mentioned above. However, mid-to upper-range LED-LCD TVs and OLED models excel in demonstrating the HDR advantages.
What is Dolby Vision
When 4K TVs are compared, it is common to come across four different HDR formats, including HDR10, HLG (Hybrid Log-Gamma), Advanced HDR by Technicolor® and Dolby Vision™. Out of these, HDR10 and Dolby Vision are the most important formats.
HDR10 is the most common HDR format and is compulsory for Ultra HD Blu-ray discs. Dolby Vision is available on streamed content from Netflix and Amazon, and select Ultra HD Blu-ray titles. The most substantial advantage of Dolby Vision over HDR10 is the addition of dynamic metadata to the core HDR image data. Which means, the HDR metadata can tell the TV to change brightness range on a scene-by-scene or even frame-by-frame basis. The most impressive part, content is mastered with 12-bit color and peak brightness of 4000 nits – Notably, no current TVs can fully reproduce these ranges.
In simple words, Dolby Vision is the jet-engine fuel which powers the best-looking content in the world. It is the format which more and more studios are turning to and connecting its potential to deliver colorful, dynamic, and calculated images on a scene-by-scene basis.
Dolby Vision vs. HDR vs. 4K – The bottom line
Dolby Vision one of the most game-changing advancements to the television. Unquestionably, 4K gives us those additional pixels, but it is HDR that made those pixels shine out like they never did before. Ultimately, all of this shows up on your TV.
