import type { Color, ReadonlyColor } from "./api.js";
export declare const alpha: (src: ReadonlyColor) => number;
/**
 * Creates version of `src` color with modified `alpha` and writes result into
 * `out` (or if null, back into `src`).
 *
 * @param out
 * @param src
 * @param alpha
 */
export declare const setAlpha: (out: Color | null, src: ReadonlyColor, alpha: number) => import("@thi.ng/vectors").Vec<number>;
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