import { type LumaStats } from './luma.js';
export type ToneStats = LumaStats;
export type SampleRegion = {
    x: number;
    y: number;
    width: number;
    height: number;
};
/** Draw → getImageData once. Returns null (no tone) on tainted canvas, decode
 * failure or zero natural size — never throws. Every call that reaches the
 * canvas records one performance measure named 'ag:sample' (REQ-SURF-153;
 * the L10 media-sampling perf spec reads it at 4× CPU throttle). */
export declare function sampleOwnedPixels(el: HTMLImageElement | HTMLVideoElement, region?: SampleRegion): ToneStats | null;
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