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(1) (High Data Rate) A CDMA 3G technology. See Qualcomm HDR.

(2) (High Dynamic Range for photos) See HDR for photos.

(3) (High Dynamic Range for TV) A high dynamic range for display screens that generates more intense colors by producing blacker blacks and whiter whites. HDR is achieved by techniques within various TV brands or with TVs that support any of the HDR encoding standards added to the content.

In the TV
OLED TVs are known for their high contrast ratio; however, backlight techniques employed on LED/LCD TVs also create a high dynamic range. For example, a common method is "local dimming," in which the light is reduced to the dark pixels in real time. See OLED, LED TV and Dolby HDR.

Added to the Content
HDR10, Dolby Vision and HLG are HDR encoding methods that are added to the video format. Introduced in the mid-2010s, the effects are rendered on TVs that support one or more of the standards.

HDR10, HDR10+
HDR10 is part of the Ultra HD 4K Blu-ray standard. It supports 10-bit color, which renders 1,024 shades, one billion colors and 1,000 nits of brightness. HDR10+ adds meta-data and supports 12-bit color (4,086 shades) and 8K resolution. See nit.

Dolby Vision
Dolby Vision supports 12-bit color, which equates to 4,096 shades, 68 billion colors and 10,000 nits, although most displays cannot handle more than 4,000 nits. See Dolby HDR.

Both HDR10 and Dolby Vision use meta-data that compliant TVs interpret but non-HDR TVs ignore. However, HDR10 meta-data affects the overall content, whereas Dolby Vision meta-data can change from scene to scene.

HLG (Hybrid Log Gamma)
Developed by the broadcast industry, HLG is the newest of the three. HLG does not use meta-data but adds a logarithmic curve to the standard dynamic range (SDR) gamma curve. HLG is compatible with old and new TVs. See contrast ratio and PQ.
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References in periodicals archive ?
1 HDR10+ is a next-generation open standard for high dynamic range (HDR) video.
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Travelxp 4K, one of the world's travel and lifestyle television channels, will start delivering its programmes in Ultra HD (UHD) and High Dynamic Range (HDR) to HD+ viewers across Germany as of 13 December 2017, the company said.
These cables allow the playback of 8K video with high dynamic range.
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On Twitter, developer Guilherme Rambo peeked into Apple's firmware for the upcoming HomePod speaker and discovered lines in the package that hint at 4K, high dynamic range and Dolby Vision support for the Apple TV.
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* Mono model offers low read noise, high dynamic range, and global shutter technology

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