/**
 * A small ICC profile reader: enough of ICC.1 (v2 and v4) to run the
 * conversions print production needs — matrix/TRC RGB and gray profiles,
 * and the lookup-table pipelines of CMYK output profiles (`mft1`, `mft2`,
 * `mAB `, `mBA `). Pure TypeScript, no WASM: it runs in the layout worker,
 * the PDF worker and Node alike.
 *
 * Pipelines work on normalized values: device channels in 0..1, and the
 * PCS as the profile encodes it (Lab or XYZ, also normalized 0..1). The
 * transform layer (`transform.ts`) turns that PCS into real Lab/XYZ.
 */
export type IccColorSpace = 'RGB' | 'CMYK' | 'GRAY' | 'Lab' | 'XYZ' | 'other';
export type IccPcs = 'Lab' | 'XYZ';
/** A normalized channel tuple; 0..1 per channel. */
export type Channels = number[];
export type Pipeline = (input: Channels) => Channels;
/** Which PCS encoding a pipeline's PCS side uses. v2 16-bit Lab (`mft2`)
 *  puts L* 100 at 0xFF00; v4 (`mAB `/`mBA `) at 0xFFFF; 8-bit (`mft1`) at
 *  0xFF. */
export type PcsEncoding = 'lab-v2' | 'lab-v4' | 'lab-8' | 'xyz';
export interface LutPipeline {
    run: Pipeline;
    inputChannels: number;
    outputChannels: number;
    pcsEncoding: PcsEncoding;
}
export interface XYZ {
    X: number;
    Y: number;
    Z: number;
}
export interface IccProfile {
    bytes: Uint8Array;
    /** Major.minor, e.g. 2.2 or 4.3. */
    version: number;
    deviceClass: string;
    colorSpace: IccColorSpace;
    pcs: IccPcs;
    description: string;
    copyright: string;
    /** Media white point (`wtpt`), D50-relative. */
    mediaWhite: XYZ;
    /** Media black point (`bkpt`) when the profile has one. */
    mediaBlack?: XYZ;
    /** Device → PCS per rendering intent (0 perceptual, 1 relative, 2 saturation). */
    aToB: Partial<Record<0 | 1 | 2, LutPipeline>>;
    /** PCS → device per rendering intent. */
    bToA: Partial<Record<0 | 1 | 2, LutPipeline>>;
    /** RGB matrix/TRC model: columns rXYZ, gXYZ, bXYZ (row-major 3×3) and
     *  the three tone curves. */
    matrixTrc?: {
        matrix: number[];
        trc: [Curve, Curve, Curve];
    };
    /** Gray TRC model. */
    grayTrc?: Curve;
    /** A short stable hash of the bytes, for caches. */
    hash: string;
}
export type Curve = (x: number) => number;
export declare class IccParseError extends Error {
}
/** Parse an ICC profile. Throws `IccParseError` on anything it cannot read
 *  (a truncated file, an unknown pipeline type in a tag it needs). */
export declare function parseIccProfile(input: Uint8Array | ArrayBuffer): IccProfile;
/** The number of device channels of a profile (4 for CMYK). */
export declare function deviceChannels(profile: IccProfile): number;
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