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Dolby Vision explained

Editorial Staff by Editorial Staff
September 19, 2022
Reading Time: 3 mins read
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Before we get stuck into Dolby Vision, itโ€™s worth talking about HDR first. HDR or High Dynamic Range refers to an image that displays far greater contrast than regular images (Standard Dynamic Range, or SDR). The dynamic range of an image is the difference between its brightest and darkest areas. The higher this range, the higher the amount of available colours, and levels of detail, on screen.

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What is Dolby Vision?

In a nutshell, Dolby Vision is another type of HDR, but more advanced with some significant differences to know about. The process of implementation flows from initial content creation, through to mastering and then, finally, to the viewing experience at home. Dolby Vision HDR carries an extra layer of clever metadata that contains frame by frame instructions to ensure the content is portrayed as accurately as possible. Dolby Vision compatible TVs use this frame by frame information from the source to improve brightness, contrast and colour performance. Regular HDR simply sends a static, basic form of metadata that applies to the entire TV show or movie youโ€™re watching. Dolby Vision can be transmitted through HDMI 1.4 devices and up, which means that an AVR with an older format can fully take advantage of the technology. Standard HDR content will still be seen by Dolby Visions compatible TVs, but will just display regular HDR metadata improvements.

Are there any other differences to know about?

Dolby Vision content is mastered in up to 12 bit colour depth, whereas regular HDR is mastered in 10 bit (which is why youโ€™ll sometimes see it referred to as HDR10). Those extra two bits add a lot of colour depth and brightness to the screen, offering access to over 68 billion colours compared to just the 1 billion with 10 bit. This means the colour will be closer to what was intended on the day of the shoot.

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Something else that helps all HDR content stand out is the brightness. The brightness of a TV is measured in nits. As an example, standard TVs are around 300 nits. To display an HDR10 image, a TV must be able to deliver a minimum of 1,000 nits. Dolby Vision can be mastered to around 4,000 nits for use on 4K compatible TVs. Actuallyโ€ฆ it can be mastered up to 10,000 nits but there isnโ€™t a TV that can currently support this. However this does mean the format is future proofed for when displays are at a level to support it. Weโ€™re looking at you 8K and beyond!

Does this mean Iโ€™ll be taking sides in another โ€˜format warโ€™?

Not exactlyโ€ฆ Dolby Vision is an improved version of HDR. To use an audio analogy, think of Dolby Vision as similar to a FLAC file, itโ€™s a premium standard that isnโ€™t as widely adopted, but offers substantially better quality. Dolby are also on record reassuring us that than the two formats arenโ€™t in competition with each other. Phew! Both can coexist nicely, as HDR10 can be utilised on Dolby Vision enabled TVs, just not the other way around. For TV manufacturers to take advantage of Dolby Vision they need to pay a license fee, whereas HDR10 is a completely free platform for manufacturers to work with.

Visit the Dolby website.

Tags: Dolby Vision
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Editorial Staff

Editorial Staff

An exceptional collection of pencils, pens and keyboards, all equally possessed by audio and video. In some dark den, hidden from all women, our editorial staff write and type about their infinite love of the audiovisual. Please, have some compassion!

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