/**
 * Matrix4(4x5)
 *
 * | r0 | g0 | b0 | a0 | tr |
 * | r1 | g1 | b1 | a1 | tg |
 * | r2 | g2 | b2 | a2 | tb |
 * | r3 | g3 | b3 | a3 | ta |
 */
export declare class ColorMatrix {
    protected _array: Float32Array<ArrayBuffer>;
    constructor();
    identity(): this;
    hueRotate(angle?: number): this;
    saturate(amount?: number): this;
    brightness(amount?: number): this;
    contrast(amount?: number): this;
    invert(amount?: number): this;
    sepia(amount?: number): this;
    opacity(amount?: number): this;
    grayscale(amount?: number): this;
    multiply(target: number[]): this;
    toArray(): Float32Array<ArrayBuffer>;
}