What the One LUT team has managed to do, though, is add the cinematic quality of the ARRI Alexa K1S1 rec709 look on top of that, creating a LUT that delivers beautiful skin tones and emulates the ARRI ...

There are a number of different formats, including .lut which controls a single parameter, usually the gamma, and .cube (used in this tutorial) which has three axes that control hue, saturation ...