Module named_transfer_fn Copy item path Source 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. 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.