procedure TImageEnMView.GetImageToFile(idx: Integer; const FileName: WideString);
var
  bmp: TIEBitmap;
begin
  fImageEnIO.Params.Assign( GetImageEnMIO.Params[idx] );
  bmp := GetTIEBitmap(idx);
  try
    fImageEnIO.AttachedIEBitmap := bmp;
    fImageEnIO.Params.UpdateEXIFThumbnail(); //Here Update Thumbnail.
    fImageEnIO.SaveToFile(FileName);
  finally
    ReleaseBitmap(idx, false);
  end;
end;

procedure UpdateEXIFThumbnail(Width: integer = 160; Height: integer = -1; ResampleFilter: TResampleFilter = rfTriangle);

ImageEnView1.IO.LoadFromFile('C:\input.jpg');
ImageEnView1.Proc.Negative;
ImageEnView1.IO.Params.UpdateEXIFThumbnail;
ImageEnView1.IO.SaveToFile('D:\output.jpg');