import { HSL, LCH, Lab, RGB, XYZ } from './Color.types';
/**
 * Converts an RGB color value to LCH color space.
 *
 * @param RGB - An array containing the red, green, and blue color values, each ranging from 0 to 255.
 * @returns An array containing the lightness (L), chroma (C), and hue (H) values.
 */
export declare function RGBtoLCH({ r: $r, g: $g, b: $b }: RGB): LCH;
/**
 * Converts an RGB color value to its hexadecimal string representation.
 *
 * @param RGB - An array containing the red, green, and blue color values.
 *              Each value should be an integer between 0 and 255.
 * @returns The hexadecimal string representation of the RGB color.
 */
export declare function RGBtoHEX({ r: $r, g: $g, b: $b }: RGB): string;
/**
 * Converts an RGB color value to HSL.
 *
 * @param RGB - An array containing the red, green, and blue color values. Each value should be in the range [0, 255].
 * @returns An array containing the hue, saturation, and lightness values.
 *          Hue is in the range [0, 360], and saturation and lightness are in the range [0, 100].
 */
export declare function RGBtoHSL({ r: $r, g: $g, b: $b }: RGB): HSL;
/**
 * Converts an RGB color value to its contrast luminosity.
 *
 * The function takes an RGB color value represented as an array of three numbers,
 * each ranging from 0 to 255, and converts it to a contrast luminosity value.
 *
 * The conversion process involves normalizing the RGB values to a range of 0 to 1,
 * applying a gamma correction, and then calculating the luminosity using the
 * standard luminosity coefficients for red, green, and blue.
 *
 * @param RGB - An array of three numbers representing the red, green, and blue
 *              components of the color, each ranging from 0 to 255.
 * @returns The contrast luminosity value as a number.
 */
export declare function RGBtoContrastLuminosity({ r, g, b }: RGB): number;
/**
 * Converts a hexadecimal color string to an RGB object.
 *
 * @param hex - The hexadecimal color string (e.g., "#FFFFFF").
 * @returns An object with the properties `r`, `g`, and `b` representing the red, green, and blue components of the color.
 */
export declare function HEXtoRGB(hex: string): RGB;
/**
 * Converts an RGB color value to XYZ color space.
 *
 * @param rgb - An object containing the red, green, and blue color values, each ranging from 0 to 255.
 * @returns An object containing the x, y, and z values in the XYZ color space.
 *
 * The conversion is based on the sRGB color space and the D65 illuminant.
 *
 * @example
 * ```typescript
 * const xyz = RGBtoXYZ({ r: 255, g: 0, b: 0 });
 * console.log(xyz); // { x: 41.24, y: 21.26, z: 1.93 }
 * ```
 */
export declare function RGBtoXYZ(rgb: RGB): XYZ;
/**
 * Converts a color from the XYZ color space to the CIELAB color space.
 *
 * @param xyz - An object containing the x, y, and z values of the color in the XYZ color space.
 * @returns An object containing the l, a, and b values of the color in the CIELAB color space.
 *
 * The conversion assumes the observer is at 2° and the illuminant is D65.
 * The input values are normalized by dividing by the reference white values:
 * - x by 95.047
 * - y by 100.000
 * - z by 108.883
 *
 * The function applies a transformation to each of the normalized values:
 * - If the value is greater than 0.008856, it is raised to the power of 1/3.
 * - Otherwise, it is transformed using the formula: 7.787 * value + 16/116.
 *
 * The resulting l, a, and b values are calculated as follows:
 * - l = 116 * y - 16
 * - a = 500 * (x - y)
 * - b = 200 * (y - z)
 */
export declare function XYZtoLab(xyz: XYZ): Lab;
/**
 * Converts a color from the LAB color space to the LCH color space.
 *
 * @param lab - An object representing the LAB color with properties:
 *   - `l`: Lightness component (0 to 100)
 *   - `a`: Green-Red component
 *   - `b`: Blue-Yellow component
 * @returns An object representing the LCH color with properties:
 *   - `l`: Lightness component (same as input)
 *   - `c`: Chroma component (calculated from `a` and `b`)
 *   - `h`: Hue component in degrees (0 to 360)
 */
export declare function LabToLCH(lab: Lab): LCH;
/**
 * Converts a HEX color code to LCH color space.
 *
 * @param hex - The HEX color code string.
 * @returns An object containing the LCH color values:
 *  - `l`: Lightness
 *  - `c`: Chroma
 *  - `h`: Hue
 */
export declare function HEXtoLCH(hex: string): LCH;
/**
 * Converts a HEX color code to an HSL color representation.
 *
 * @param hex - The HEX color code string (e.g., "#FFFFFF").
 * @returns The HSL color representation.
 */
export declare function HEXtoHSL(hex: string): HSL;