import type { DiffOverlayResult, DiffRegion } from "./types.js";
/**
 * Generate a diff overlay image highlighting changed pixels between baseline and current.
 * Orange overlay on changed pixels, bounding boxes around changed regions, numbered labels.
 */
export declare function generateDiffOverlay(baseline: Buffer, current: Buffer, options?: {
    threshold?: number;
    ignoreRegions?: DiffRegion[];
}): Promise<DiffOverlayResult>;
//# sourceMappingURL=overlay.d.ts.map