BT.2100

ITU-R Recommendation BT.2100, more commonly known by the abbreviations Rec. 2100 or BT.2100, defines various aspects of high dynamic range (HDR) video such as display resolution (HDTV and UHDTV), frame rate, chroma subsampling, bit depth, color space, and optical transfer function. It was posted on the International Telecommunication Union (ITU) website on July 4, 2016. Rec. 2100 expands on several aspects of Rec. 2020.

Rec. 2100 defines three resolutions of 1080p, 3840 × 2160 ("4K"), and 7680 × 4320 ("8K"). These resolutions have an aspect ratio of 16:9 and use square pixels.

Rec. 2100 specifies the following frame rates: 120p, 119.88p, 100p, 60p, 59.94p, 50p, 30p, 29.97p, 25p, 24p, 23.976p. Only progressive scan frame rates are allowed.

Rec. 2100 defines a bit depth of either 10-bits per sample or 12-bits per sample, with either narrow range or full range color values.

For narrow range color, 10-bits per sample use video levels where the black level is defined as 64, achromatic gray level as 512 and the nominal peak as 940 in RGB encoding and 960 in YCbCr encoding. Codes 0–3 and 1,020–1,023 can be used for the timing reference and should be avoided. 12-bits per sample use 256 as the black level, 2048 as the achromatic gray level and the nominal peak is 3760 in RGB encoding and 3840 in YCbCr encoding. Codes 0–15 and 4,080–4,095 can be used for the timing reference and should be avoided.

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