/** @category Drawing */
export declare function parseToRgba(color: string): readonly [number, number, number, number];
/** @category Drawing */
export declare function withAlpha(color: string, alpha: number): string;
export declare function blendCache(color: string, background: string | undefined): string;
/** @category Drawing */
export declare function blend(color: string, background: string | undefined): string;
/** @category Drawing */
export declare function interpolateColors(leftColor: string, rightColor: string, val: number): string;
/**
 * Returns a number (float) representing the luminance of a color.
 *
 * @category Drawing
 */
export declare function getLuminance(color: string): number;
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