/**
 * 黑白效果
 * @example
 * ```ts
 * viewer.effect.blackAndWhite.enable = true
 * ```
 */
declare class BlackAndWhite {
    private _viewer;
    private _delegate;
    private _enable;
    private _gradations;
    private _selected;
    private _state;
    constructor();
    /**
     * 类型
     * @ignore
     */
    get type(): string;
    /**
     * 是否启用
     */
    set enable(enable: boolean);
    get enable(): boolean;
    /**
     * 强度
     */
    set gradations(gradations: number);
    get gradations(): number;
    /**
     * 设置后期作用的覆盖物
     */
    set selected(selected: any[]);
    get selected(): any[];
    /**
     *
     */
    private _createPostProcessStage;
    /**
     * 添加特效
     * @param viewer
     * @returns {BlackAndWhite}
     * @ignore
     */
    addTo(viewer: Cesium.Viewer): BlackAndWhite;
}
export default BlackAndWhite;