interface IContraColor {
    color: string;
    contrast: number;
}
/** get a contrasting color for a given color. If `isLinearLuminance` is true, it will use the linear luminance formula. Otherwise, it will use power curve.
 * Set `contrastDiff` as 0 to find color with maximum contrast. If you pass a number in range (0,20], it will find a color with a the smallest contrast that is greater then `contrastDiff`
 * @param  {string} c
 * @param  {} isLinearLuminance=true
 * @param  {} contrastDiff=0
 * @returns IContraColor
 */
export declare function getContrastingColor(c: string, isLinearLuminance?: boolean, contrastDiff?: number): IContraColor;
/** Find contrast of two colors. If you pass `isLinearLuminance`, it will calculate luminance with power curve.
 * @param  {string} c1
 * @param  {string} c2
 * @param  {} isLinearLuminance=true
 * @returns number
 */
export declare function getContrast(c1: string, c2: string, isLinearLuminance?: boolean): number;
export {};