/**
 * Extracts gain map metadata and the gain map recovery image
 * from a single JPEG file.
 *
 * ISO 21496-1 metadata is preferred when present, XMP (Ultra HDR / Adobe hdrgm) is used as fallback.
 *
 * @category Decoding Functions
 * @group Decoding Functions
 * @param jpegFile an `Uint8Array` containing and encoded JPEG file
 * @returns an sdr `Uint8Array` compressed in JPEG, a gainMap `Uint8Array` compressed in JPEG and the parsed metadata
 * @throws Error if neither ISO 21496-1 nor XMP Metadata is found
 * @throws Error if Gain map image is not found
 * @example
 * import { FileLoader } from 'three'
 * import { extractGainmapFromJPEG } from '@monogrid/gainmap-js'
 *
 * const jpegFile = await new FileLoader()
 *  .setResponseType('arraybuffer')
 *  .loadAsync('image.jpg')
 *
 * const { sdr, gainMap, metadata } = extractGainmapFromJPEG(jpegFile)
 */
export declare const extractGainmapFromJPEG: (jpegFile: Uint8Array<ArrayBuffer>) => Promise<{
    sdr: Uint8Array<ArrayBuffer>;
    gainMap: Uint8Array<ArrayBuffer>;
    metadata: import("..").GainMapMetadata;
}>;