import * as gl from 'gl-matrix';
export declare function createHueMatrix(degrees: number): gl.mat4;
export declare function createSaturationMatrix(s: number): gl.mat4;
export declare function createContrastMatrix(r: number, g: number, b: number): gl.mat4;
export declare function createBrightnesMatrix(r: number, g: number, b: number): gl.mat4;