delphi中应用自定义透明色控制的TImage组

procedure TForm1.FormCreate(Sender: TObject) ;
begin
  Image1.Transparent := False;

  Image2.Transparent := True;

  Image3.Transparent := True;

  with Image3.Picture.Bitmap do
  begin
    //middle of the image
    TransparentColor := Canvas.Pixels[24,24];
    //actually not needed
    TransparentMode := tmFixed;
  end;
end;