import type { Color, TypedColor } from "./api.js";
/**
 * Adjust the "lightness" (luma, brightness etc.) channel of given `src` color
 * and `delta` offset. Writes result into `out` (or if null, back into `src`).
 *
 * @remarks
 * If `offset` is negative, then color will be darkened.
 *
 * @param out -
 * @param src -
 * @param delta -
 */
export declare const lighten: import("@thi.ng/defmulti").MultiFn3<Color | null, TypedColor<any>, number, Color>;
//# sourceMappingURL=lighten.d.ts.map