export interface C64Block {
    /** Palette indices: [background, local1, local2, local3] */
    colors: [number, number, number, number];
    colorsPalette: [number, number, number][];
    /** 32 entries, each a palette index from `colors` */
    pixels: number[];
}
export interface C64Bitmap {
    background: number;
    backgroundPalette: [number, number, number];
    blocks: C64Block[];
}
export declare class C64ImageQuantizer {
    readonly filePath: string;
    readonly processed: boolean;
    readonly dither: boolean;
    readonly progressStartCallback?: (total: number, message: string) => void;
    readonly progressCallback?: (current: number, total: number) => void;
    readonly progressFinishCallback?: () => void;
    constructor(filePath: string, dither?: boolean, extendedColors?: boolean, progressStartCallback?: (total: number, message: string) => void, progressCallback?: (current: number, total: number) => void, progressFinishCallback?: () => void);
    private C64Pallete;
    private C64PaletteRGB;
    private C64PaletteLAB;
    private readonly LUT_BITS;
    private readonly LUT_SIZE;
    private readonly LUT_SHIFT;
    private C64PaletteLUT;
    private buildRgbLut;
    private perceivedMixColor;
    private precalculateColors;
    private nearestC64Color;
    private nearestC64ColorConstrained;
    private imageWidth;
    private imageHeight;
    private pixels;
    private pixelsDither;
    private loadImage;
    private blocksWidth;
    private blocksHeight;
    private blocks;
    private imageToBlocks;
    private chooseBestBackground;
    private kMeans;
    private bestColorsForBlock;
    private quantizeBlock;
    private quantizeBlockDithered;
    private quantizeBlocks;
    processImage(): Promise<C64Bitmap>;
}
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