/**
 * Color management utilities for flame graph rendering
 */
/**
 * Convert hex color to RGB array (0-1 range)
 */
export declare function hexToRgb(hex: string): [number, number, number];
/**
 * Convert RGB array (0-1 range) to hex color
 */
export declare function rgbToHex(r: number, g: number, b: number): string;
/**
 * Interpolate between two colors
 */
export declare function interpolateColor(color1: [number, number, number], color2: [number, number, number], t: number): [number, number, number];
/**
 * Get color for a frame based on its relative size at the same depth level
 * This is used by the FlameGraph renderer
 */
export declare function getFrameColorBySameDepthRatio(primaryColor: [number, number, number], secondaryColor: [number, number, number], frameValue: number, totalValueAtDepth: number): [number, number, number];
/**
 * Get hex color for a frame based on its relative size at the same depth level
 * This is used by the FlameGraph renderer
 */
export declare function getFrameColorHexBySameDepthRatio(primaryColorHex: string, secondaryColorHex: string, frameValue: number, totalValueAtDepth: number): string;
/**
 * Apply opacity to a color
 */
export declare function withOpacity(color: [number, number, number], opacity: number): [number, number, number, number];
/**
 * Darken a color by a factor
 */
export declare function darken(color: [number, number, number], factor: number): [number, number, number];
/**
 * Lighten a color by a factor
 */
export declare function lighten(color: [number, number, number], factor: number): [number, number, number];
/**
 * Get a readable text color (black or white) for a given background
 */
export declare function getContrastColor(backgroundColor: [number, number, number]): [number, number, number];
/**
 * Validate if a string is a valid hex color
 */
export declare function isValidHex(hex: string): boolean;
/**
 * Normalize hex color (ensure it has # prefix and is 6 digits)
 */
export declare function normalizeHex(hex: string): string;
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