rullino
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    Variable blackPointConst

    blackPoint: PointwiseFilter<
        {
            amount: {
                default: 0;
                description: "Positive values crush the shadows towards black; negative values lift them.";
                label: "Amount";
                max: 0.2;
                min: -0.2;
                step: 0.005;
                type: "float";
            };
        },
    > = ...

    Black point on OKLab lightness: L' = max(0, (L − b) / (1 − b)). A positive amount crushes shadows to black, a negative one lifts black to a faded grey; white stays put. Hue and chroma are untouched.