F# Active Parttern to break down data

// break down into tuple
open System.Drawing
let (|RGB|) (col:System.Drawing.Color) =  (col.R, col.G, col.B)
let (|HSB|) (col:System.Drawing.Color) = (col.GetHue(), col.GetSaturation(),col.GetBrightness())

//parsing
open System
let (|Int|_|)(x:string) =
    let mutable y =0.0
    if System.Double.TryParse(x, &y) then Some(x)
    else None

let PrintRGB x =
    match x with
    | RGB (r,g,b) -> printfn"%d %d %d" r g b

let Parse x =
    match x with
    | Int t -> printfn "%A" t
    | _ -> printfn "not integer"