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procedure TForm1.Button2Click(Sender: TObject);
begin
  if ColorDialog1.Execute then
    begin
        Form2.Color := ColorDialog1.Color;
    end;
end;					

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unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    GroupBox1: TGroupBox;
    Button1: TButton;
    RadioButton1: TRadioButton;
    RadioButton2: TRadioButton;
    OpenDialog1: TOpenDialog;
    ColorDialog1: TColorDialog;
    Button2: TButton;
    procedure RadioButton1Click(Sender: TObject);
    procedure FormShow(Sender: TObject);
    procedure RadioButton2Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

uses Unit2;

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
  if OpenDialog1.Execute then
    begin
      Form2.Image1.Align := alClient;
      Form2.Image1.Picture.LoadFromFile(OpenDialog1.Filename);
    end;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  if ColorDialog1.Execute then
    begin
        Form2.Color := ColorDialog1.Color;
    end;
end;

procedure TForm1.FormShow(Sender: TObject);
begin
  Button1.Enabled := False;
  Button2.Enabled := False;
end;

procedure TForm1.RadioButton1Click(Sender: TObject);
begin
  Button1.Enabled := True;
  Button2.Enabled := False;
end;

procedure TForm1.RadioButton2Click(Sender: TObject);
begin
  Button1.Enabled := False;
  Button2.Enabled := True;
end;

end.