/**
 * 颜色工具类
 */
export declare class colorUtils {
    constructor();
    /**
     * 判断是否 十六进制颜色值.
     * 输入形式可为 #fff000 #f00
     *
     * @param   String  color   十六进制颜色值
     * @return  Boolean
     */
    isHexColor: (color: string) => boolean;
    /**
     * RGB 颜色值转换为 十六进制颜色值.
     * r, g, 和 b 需要在 [0, 255] 范围内
     *
     * @return  String          类似#ff00ff
     * @param r
     * @param g
     * @param b
     */
    rgbToHex: (r: number, g: number, b: number) => string;
    /**
     * Transform a HEX color to its RGB representation
     * @param {string} hex The color to transform
     * @returns The RGB representation of the passed color
     */
    hexToRGB: (hex: string, opacity?: number) => string;
    colorIsDark: (color: string) => boolean | undefined;
    /**
     * Darkens a HEX color given the passed percentage
     * @param {string} color The color to process
     * @param {number} amount The amount to change the color by
     * @returns {string} The HEX representation of the processed color
     */
    darken: (color: string, amount: number) => string;
    /**
     * Lightens a 6 char HEX color according to the passed percentage
     * @param {string} color The color to change
     * @param {number} amount The amount to change the color by
     * @returns {string} The processed color represented as HEX
     */
    lighten: (color: string, amount: number) => string;
    /**
     * Sums the passed percentage to the R, G or B of a HEX color
     * @param {string} color The color to change
     * @param {number} amount The amount to change the color by
     * @returns {string} The processed part of the color
     */
    addLight: (color: string, amount: number) => string;
    /**
     * Calculates luminance of an rgb color
     * @param {number} r red
     * @param {number} g green
     * @param {number} b blue
     */
    luminanace: (r: number, g: number, b: number) => number;
    /**
     * Calculates contrast between two rgb colors
     * @param {string} rgb1 rgb color 1
     * @param {string} rgb2 rgb color 2
     */
    contrast: (rgb1: string[], rgb2: number[]) => number;
    /**
     * Determines what the best text color is (black or white) based con the contrast with the background
     * @param hexColor - Last selected color by the user
     */
    calculateBestTextColor: (hexColor: string) => "#000000" | "#FFFFFF";
    /**
     * Subtracts the indicated percentage to the R, G or B of a HEX color
     * @param {string} color The color to change
     * @param {number} amount The amount to change the color by
     * @returns {string} The processed part of the color
     */
    subtractLight: (color: string, amount: number) => string;
}