hi_dynamic_range

Description

Defines the dynamic ranges.

Prototype

typedef enum {
    HI_DYNAMIC_RANGE_SDR8 = 0,
    HI_DYNAMIC_RANGE_SDR10,
    HI_DYNAMIC_RANGE_HDR10,
    HI_DYNAMIC_RANGE_HLG,
    HI_DYNAMIC_RANGE_SLF,
    HI_DYNAMIC_RANGE_XDR,
    HI_DYNAMIC_RANGE_BUTT
} hi_dynamic_range;

Members

Member	Description
HI_DYNAMIC_RANGE_SDR8	8-bit standard dynamic range.
HI_DYNAMIC_RANGE_SDR10	10-bit standard dynamic range.
HI_DYNAMIC_RANGE_HDR10	10-bit high dynamic range.
HI_DYNAMIC_RANGE_HLG	Hybrid Log-Gamma (HLG).
HI_DYNAMIC_RANGE_SLF	Reserved.
HI_DYNAMIC_RANGE_XDR	10-bit data type used for algorithm processing, which can be ignored.
HI_DYNAMIC_RANGE_BUTT	Reserved.

Considerations

The curves of these dynamic ranges are described as follows.

Dynamic Range	Transfer Characteristic
SDR8/ SDR10	V = α * Lc^0.45 − (α − 1) for 1 >= L_c >= β V = 4.500 * L_c for β > L_c >= 0
HDR10	V = ( ( c₁ + c₂ * L_cⁿ ) ÷ ( 1 + c₃ * L_cⁿ ) ) for all values of L_c c₁ = c₃ − c₂ + 1 = 3424 ÷ 4096 = 0.8359375 c₂ = 32 * 2413 ÷ 4096 = 18.8515625 c₃ = 32 * 2392 ÷ 4096 = 18.6875 m = 128 * 2523 ÷ 4096 = 78.84375 n = 0.25 * 2610 ÷ 4096 = 0.1593017578125 For which L_c equal to 1 for peak white is ordinarily intended to correspond to a reference output luminance level of 10000 candelas per square metre.
HLG	V = a * Ln( 12 * L_c − b ) + c for 1 >= L_c > 1 ÷ 12 V = Sqrt( 3 ) * L_c^0.5 for 1 ÷ 12 >= L_c >= 0 a = 0.17883277, b = 0.28466892, c = 0.55991073

Dynamic Range

Transfer Characteristic

SDR8/ SDR10

V = α * Lc^0.45 − (α − 1) for 1 >= L_c >= β

V = 4.500 * L_c for β > L_c >= 0

HDR10

V = ( ( c₁ + c₂ * L_cⁿ ) ÷ ( 1 + c₃ * L_cⁿ ) ) for all values of L_c

c₁ = c₃ − c₂ + 1 = 3424 ÷ 4096 = 0.8359375

c₂ = 32 * 2413 ÷ 4096 = 18.8515625

c₃ = 32 * 2392 ÷ 4096 = 18.6875

m = 128 * 2523 ÷ 4096 = 78.84375

n = 0.25 * 2610 ÷ 4096 = 0.1593017578125

For which L_c equal to 1 for peak white is ordinarily intended to correspond to a reference output luminance level of 10000 candelas per square metre.

HLG

V = a * Ln( 12 * L_c − b ) + c for 1 >= L_c > 1 ÷ 12

V = Sqrt( 3 ) * L_c^0.5 for 1 ÷ 12 >= L_c >= 0

a = 0.17883277, b = 0.28466892, c = 0.55991073

Parent topic: Common