/** Converts `#rrggbb` (or `#rgb`) to a normalized `[r, g, b]` triple (0–1). */
export declare function hexToRgb(hex: string): [number, number, number];
/**
 * Converts `#rgb` / `#rgba` / `#rrggbb` / `#rrggbbaa` to a normalized
 * `[r, g, b, a]` quad (0–1). Alpha defaults to 1 when the hex omits it.
 *
 * Paper's shader takes colors as `vec4`, and for `u_colorTint` the alpha is a
 * blend *amount* (how much colour-burn to apply), not an opacity — so the
 * 8-digit form is the normal way to write a tint here, not an edge case.
 */
export declare function hexToRgba(hex: string): [number, number, number, number];
export declare function rgbToHsv(r: number, g: number, b: number): [number, number, number];
export declare function hsvToRgb(h: number, s: number, v: number): [number, number, number];