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var
  i, l, t: Integer;
  DestRect, SourceRect: TRect;
begin
//128 x 100 Pixel
  l := -128;
  t := -100;
  DestRect.Left := 0;
  DestRect.Top := 0;
  DestRect.Right := 128;
  DestRect.Height := 100;
  SourceRect := DestRect;

  for i := 1 to 25 do
  begin
    Inc(l, 128);

    SourceRect.Left := l;
    SourceRect.Top := t;
    SourceRect.Right := l+128;
    SourceRect.Height := t+100;

    Image2.Picture.Bitmap.Canvas.CopyRect(DestRect,
      Image1.Picture.Bitmap.Canvas, SourceRect);

    Image2.Picture.Bitmap.SaveToFile('D:\Delphi XE2\Projects\'+IntToStr(i)+'.bmp');

    if i mod 5 = 0 then
    begin
      l := -128;
      t := t+100;
    end;
  end;

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var
  x, y: Integer;
  DestRect, SourceRect: TRect;
begin
  DestRect := Rect(0, 0, 128, 100);
  SourceRect := DestRect;
  for y := 0 to 4 do
    for x := 0 to 4 do
    begin
      SourceRect.SetLocation(x * 128, y * 100);
      Image2.Picture.Bitmap.Canvas.CopyRect(DestRect, Image1.Picture.Bitmap.Canvas, SourceRect);
      Image2.Picture.Bitmap.SaveToFile('D:\Delphi XE2\Projects\' + IntToStr(y * 5 + x) + '.bmp');
    end;