EOTF — Electro-Optical Transfer Function

The function that turns encoded video code values into actual light output on screen. SDR follows a gamma curve (approximately 2.2–2.4); HDR goes through PQ (SMPTE ST 2084, absolute nits up to 10,000) or HLG (relative, backwards compatible). A mismatch between the content's EOTF and the EOTF set on the display gives washed-out or crushed images — the single most common HDR setup error.