Variable thresholdConst

threshold: PointwiseFilter<
    {
        invert: {
            default: false;
            description: "Swap black and white.";
            label: "Invert";
            type: "bool";
        };
        level: {
            default: 0.5;
            description: "The brightness cut-off. Higher values leave less white.";
            label: "Level";
            max: 1;
            min: 0;
            step: 0.01;
            type: "float";
        };
    },
> = ...