// Copy the area of the background image under the current layer to another ImageEnView
var
  lyr: TIELayer;
begin
  lyr := ImageEnView1.CurrentLayer;
  ImageEnView2.IEBitmap.Allocate( lyr.Width, lyr.Height, clNone );
  ImageEnView1.Layers[0].Bitmap.CopyRectTo( ImageEnView2.IEBitmap, lyr.PosX, lyr.PosY, 0, 0, lyr.Width, lyr.Height, True );
  ImageEnView2.Update();
end;