/** BT.709 luminance of one sRGB pixel (0..1). */
export declare function pixelLuma(r: number, g: number, b: number): number;
export interface LumaStats {
    mean: number;
    p10: number;
    p90: number;
    stdev: number;
}
/** computeLumaStats(data, width, height): percentile luma stats over an RGBA
 * buffer (getImageData shape). Alpha <128 pixels are ignored. */
export declare function computeLumaStats(data: Uint8ClampedArray | number[], width: number, height: number): LumaStats;
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