sig
type color = { red : int; green : int; blue : int; alpha : int; }
val rgb : int -> int -> int -> Color.color
val rgba : int -> int -> int -> int -> Color.color
val gray : int -> Color.color
val graya : int -> int -> Color.color
val hsv : int -> int -> int -> Color.color
val hsva : int -> int -> int -> int -> Color.color
val hex : string -> Color.color
end