2.7. Detailed Transfer Function Descriptions

2.7.1. Transfer Function SMPTE 2084 (V4L2_XFER_FUNC_SMPTE2084)

The SMPTE ST 2084 standard defines the transfer function used by High Dynamic Range content.

Constants:

m1 = (2610 / 4096) / 4

m2 = (2523 / 4096) * 128

c1 = 3424 / 4096

c2 = (2413 / 4096) * 32

c3 = (2392 / 4096) * 32

Transfer function:

L’ = ((c1 + c2 * L^m1) / (1 + c3 * L^m1))^m2

Inverse Transfer function:

L = (max(L’^1/m2 - c1, 0) / (c2 - c3 * L’^1/m2))^1/m1