How to Async Grayscale Image in OCaml - Code Snippet

(* Task: Async Grayscale Image
(* Language: OCaml

let async_grayscale_image() =
    (* Implementation for Async Grayscale Image
    let result = ...; (* Initialize variable
    (* TODO: Implement core logic here
    (* Step 1: Prepare data
    (* Step 2: Process Async Grayscale Image
    print_endline("Done");
;;