export interface PixelDiffInput {
    readonly base64A: string;
    readonly base64B: string;
}
export interface PixelDiffResult {
    readonly differencePercent: number;
    readonly pixelsChanged: number;
    readonly totalPixels: number;
    readonly dimensions: {
        readonly width: number;
        readonly height: number;
    };
    readonly diffImageBase64: string;
}
/**
 * Compute pixel-level difference between two base64 PNG images.
 *
 * If the images have different dimensions, both are padded to the
 * larger bounding box (extra pixels treated as transparent black,
 * which will show as differences).
 *
 * Returns the diff percentage, pixel count, dimensions, and a
 * red-highlighted diff image as base64 PNG.
 */
export declare function computePixelDiff(input: PixelDiffInput): PixelDiffResult;
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