import { Matrix3d } from "./matrix3d.ts";
/**
 * A 4x4 color transformation matrix extending {@link Matrix3d}.
 * Provides chainable methods for common color adjustments.
 * @category Math
 * @example
 * // grayscale
 * const cm = new ColorMatrix().saturate(0.0);
 * @example
 * // combine brightness + contrast
 * const cm = new ColorMatrix().brightness(1.3).contrast(1.5);
 */
export declare class ColorMatrix extends Matrix3d {
    /**
     * Apply a brightness adjustment.
     * @param amount - brightness multiplier (1.0 = normal, >1 brighter, <1 darker)
     * @returns this instance for chaining
     */
    brightness(amount: number): this;
    /**
     * Apply a contrast adjustment.
     * @param amount - contrast multiplier (1.0 = normal, >1 more contrast, <1 less)
     * @returns this instance for chaining
     */
    contrast(amount: number): this;
    /**
     * Apply a saturation adjustment.
     * @param amount - saturation level (0.0 = grayscale, 1.0 = normal, >1 over-saturated)
     * @returns this instance for chaining
     */
    saturate(amount: number): this;
    /**
     * Apply a hue rotation.
     * @param angle - rotation angle in radians
     * @returns this instance for chaining
     */
    hueRotate(angle: number): this;
    /**
     * Apply a sepia tone.
     * @param amount - sepia intensity (0.0 = original, 1.0 = full sepia)
     * @returns this instance for chaining
     */
    sepia(amount?: number): this;
    /**
     * Apply a color inversion.
     * @param amount - inversion amount (0.0 = original, 1.0 = fully inverted)
     * @returns this instance for chaining
     */
    invertColors(amount?: number): this;
}
//# sourceMappingURL=color_matrix.d.ts.map