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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls;

type
  TForm1 = class(TForm)
    Timer1: TTimer;
    procedure Timer1Timer(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

function GetScreenPixelColor(X, Y: Integer): TColor;
var
  DC: hDC;
begin
  DC:=GetDC(0);
  Result:=GetPixel(DC, X, Y);
  ReleaseDC(0, DC);
end;
procedure TForm1.Timer1Timer(Sender: TObject);
var Mausposition: TPoint;
begin
  Mausposition:=Mouse.CursorPos;
  self.Color := GetScreenPixelColor(Mausposition.x, Mausposition.y);
end;

end.