rullino
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    Variable brightnessConst

    brightness: PointwiseFilter<
        {
            amount: {
                default: 0;
                description: "Negative darkens, positive lightens; 0 changes nothing.";
                label: "Amount";
                max: 1;
                min: -1;
                step: 0.01;
                type: "float";
            };
        },
    > = ...

    Midtone brightness: a power curve on OKLab lightness, L' = L^(2^-amount). Black (L = 0) and white (L = 1) stay put; hue and chroma are untouched. Unlike gamma, which bends each linear RGB channel independently.