Module named_transfer_fn

Constants§

A98_RGB: https://www.w3.org/TR/css-color-4/#predefined-a98-rgb
DOT22
HLG: Rec. ITU-R BT.2100-2 hybrid log-gamma (HLG) system, value 18.
IEC61966_2_1: IEC 61966-2-1 sRGB, value 13.
IEC61966_2_4: IEC 61966-2-4, value 11, same as REC709 (but is explicitly extended).
LINEAR: Linear, value 8
PQ: Rec. ITU-R BT.2100-2 perceptual quantization (PQ) system, value 16.
PRO_PHOTO_RGB: https://w3.org/TR/css-color-4/#valdef-color-prophoto-rgb “The transfer curve is a gamma function with a value of 1/1.8”
REC601: Rec. ITU-R BT.601-7, same as kRec709, value 6.
REC709: Rec. ITU-R BT.709-6, value 1. This follows note 1, which reads: “In the cases of […] TransferCharacteristics equal to 1, 6, 14 or 15 […], although the value is defined in terms of a reference [OETF], a suggested corresponding reference [EOTF] has been specified in Rec. ITU-R BT.1886-0.”
REC470_SYSTEM_BG: Rec. ITU-R BT.470-6 System B, G (historical) assumed display gamma 2.8, value 5.
REC470_SYSTEM_M: Rec. ITU-R BT.470-6 System M (historical) assumed display gamma 2.2, value 4.
REC2020_10BIT: Rec. ITU-R BT.2020-2 (10-bit system), value 14.
REC2020_12BIT: Rec. ITU-R BT.2020-2 (12-bit system), value 15.
SMPTE_ST_240: SMPTE ST 240, value 7.
SMPTE_ST_428_1: SMPTE ST 428-1, value 17.
SRGB

CicpId: Mapping between transfer function names and the number of the corresponding row in ITU-T H.273, table 3. As above, the constants are named based on the first specification referenced in the value’s row.