import type { DiffRegion, ScreenDiffResult } from "./types.js";
/**
 * Compare two screenshot buffers pixel-by-pixel.
 * Returns change percentage and bounding box of changed region.
 * Samples every 2nd pixel for speed.
 */
export declare function compareScreenshots(prev: Buffer, next: Buffer, threshold?: number): Promise<ScreenDiffResult>;
/**
 * Crop a region from a PNG buffer with padding.
 * Returns the cropped image as a PNG buffer.
 */
export declare function cropRegion(pngBuffer: Buffer, region: DiffRegion, padding?: number): Promise<Buffer>;
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