procedure Image_NotThreadSafe(Image: TImage);
begin
  //It does not matter if the parameter is Param, Const or Var
  //Because I'm passing an object class.

  Image.Picture.Bitmap.SetSize( 0, 0 );
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Image1.Picture.LoadFromFile( 'Tulips.jpg' );
  Image_NotThreadSafe( Image1 );
end;

// Method that takes an image, splits it into multiple cells and saves each cell to file
procedure SplitImage(Bitmap: TIEBitmap; cols, rows: integer; DestFolder: string);
var
  cellWidth, cellHeight: Double;
  x,y : Integer;
  outBmp: TIEBitmap;
begin
  cellWidth := Bitmap.Width / cols;
  cellHeight := Bitmap.Height / rows;

  outBmp := TIEBitmap.Create;
  outBmp.Allocate( Round( cellWidth ), Round( cellHeight ));

  for x := 0 to cols do
    for y := 0 to rows do
    begin
      Bitmap.CopyRectTo( outBmp,
                         Round( cellWidth * x ), Round( cellHeight * y ),
                         0, 0,
                         Round( cellWidth ), Round( cellHeight ));
      outBmp.Write( IncludeTrailingBackSlash( DestFolder ) + IntToStr( x ) + '_' + IntToStr( y ) + '.bmp' );
    end;

  outBmp.Free;
end;