export type BayerSize = 2 | 4 | 8 | 16;
export declare const BAYER_SIZES: readonly [{
    readonly label: "2x2";
    readonly value: 2;
}, {
    readonly label: "4x4";
    readonly value: 4;
}, {
    readonly label: "8x8";
    readonly value: 8;
}, {
    readonly label: "16x16";
    readonly value: 16;
}];
export declare const BAYER_MATRICES: Record<BayerSize, number[][]>;
export declare const DIFFUSION_KERNELS: Record<string, Array<[number, number, number]>>;
export declare function getClosestColor(colors: number[][], [r2, g2, b2]: number[]): number[];
export declare function rgbQuantDiffusionDither(ctx: CanvasRenderingContext2D, imageData: ImageData, palette: number[][], blockSize: number, kernelName: string, serpentine: boolean, smoothDownscale?: boolean): void;
export declare function addPixelation(ctx: CanvasRenderingContext2D, sourceCanvas: HTMLCanvasElement, width: number, height: number, blockSize: number, smoothDownscale?: boolean): void;
export declare function bayerDither(ctx: CanvasRenderingContext2D, imageData: ImageData, palette: number[][], blockSize: number, bayerSize?: BayerSize, smoothDownscale?: boolean): void;
export declare function kernelDiffusionDither(ctx: CanvasRenderingContext2D, imageData: ImageData, palette: number[][], blockSize: number, kernelName: string, serpentine: boolean, colorSpace: 'rgb' | 'oklab', smoothDownscale?: boolean): void;
export declare function simple2DDither(ctx: CanvasRenderingContext2D, imageData: ImageData, palette: number[][], blockSize: number, colorSpace?: 'rgb' | 'oklab', smoothDownscale?: boolean): void;
export declare function hilbertD2XY(n: number, d: number): [number, number];
export declare function blueNoiseDither(ctx: CanvasRenderingContext2D, imageData: ImageData, palette: number[][], blockSize: number, smoothDownscale?: boolean): void;
export declare function riemersmaDither(ctx: CanvasRenderingContext2D, imageData: ImageData, palette: number[][], blockSize: number, colorSpace?: 'rgb' | 'oklab', smoothDownscale?: boolean): void;