declare enum Channel {
    R = 0,
    G = 1,
    B = 2
}
type Colors = [r: number, g: number, b: number, uses: number];
type Bucket = {
    colors: Colors[];
    total: number;
    channel: Channel;
    minR: number;
    minG: number;
    minB: number;
    maxR: number;
    maxG: number;
    maxB: number;
};
type Options = {
    strict: boolean;
};
/**
 * @class MedianCut
 */
export default class MedianCut {
    imageData: ImageData;
    options: Options;
    colors: Colors[];
    buckets: Bucket[];
    private readonly __bucketsPerStep;
    static averageColor(colors: Colors[]): [r: number, g: number, b: number];
    private get roundingBits();
    get palette(): [r: number, g: number, b: number][];
    get bucketsPerStep(): [(Bucket[] | undefined)?];
    /**
     * @constructor
     */
    constructor(imageData: ImageData, options?: Options);
    /**
     * 減色処理
     * @param colorSize 減色する色数
     */
    reduce(colorSize: number): ImageData;
    /**
     * 使用している色数を計算（メモリ節約の為に下位3bitを丸める）
     */
    private calculateColorCount;
    /**
     * colorsの合計の使用数と最大範囲のチャンネルを返却
     */
    private getTotalAnGreatestRangeChannel;
    /**
     * 中央値を算出して分割
     * @param  buckets bucket情報
     * @param  colorSize 減色後の色数
     */
    private __mediancut;
    /**
     * bucketを生成
     * @private
     */
    private generateBucket;
}
export {};