For clarity, precision, and a bit of pedantry, the IEC 61966–2‑1:1999 Standard does not specify an OETF but only an EOTF, so the OETF in the linked article is a

For clarity, precision, and a bit of pedantry, the IEC 61966–2‑1:1999 Standard does not specify an OETF but only an EOTF, so the OETF in the linked article is actually an Inverse EOTF. Some more information here: https://www.colour-science.org/posts/srgb-eotf-pure-gamma-22-or-piece-wise-function/ https://www.colour-science.org/posts/srgb-eotf-pure-gamma-22...