rullino
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    Variable transparencyConst

    transparency: PointwiseFilter<
        {
            amount: {
                default: 1;
                description: "How transparent the result is: 0 leaves it opaque, 1 makes it fully see-through.";
                label: "Amount";
                max: 1;
                min: 0;
                step: 0.01;
                type: "float";
            };
        },
    > = ...

    Fades pixels out: premultiplied colour and alpha are both scaled by (1 - amount), so the straight colour is kept. With a mask it is the cut-out tool: paint the area to remove.