var
  _mSelect: TIEArrayOfInteger;
  i: Integer;
begin
  _mSelect := ImageEnMView1.MultiSelectedImagesList;
  ImageEnMView1.Deselect;
  for i := High(_mSelect) downto Low(_mSelect) do
    begin
      ImageEnMView1.SelectImage(_mSelect[i]);
      ImageEnMView1.Proc.ConvertTo(...);
      ImageEnMView1.Deselect;
    end;
end;