/**
 * blend threshold and transition
 */
export type LayerTransition = {
    lower: number;
    upper: number;
};
export type Compositor = (base: number, val: number, weight: number) => number;
export declare enum BlendMode {
    ADD = "addition",
    SUB = "difference",
    MUL = "product",
    DIV = "division",
    MIN = "brighter",
    MAX = "darker"
}
/**
 * @param mode
 * @returns compositor function
 */
export declare const getCompositor: (blendMode: BlendMode) => Compositor;