// Three ways to mark an area of the image with a red box...

myRect := Rect( x, y, x + width, y + height );

// Draw onto bitmap
with ImageEnView1.IEBitmap.Canvas do
begin
  Pen.Color := clRed;
  Pen.Width := 4;
  Brush.Style := bsClear;
  Rectangle( myRect );
end;

// Use rectangle shape layer
ImageEnView1.LayersClear( False );
...
ImageEnView1.LayersAdd( iesRectangle, myRect, clRed, 4 );


// Use TImageEnVect Box Object
ImageEnVect1.RemoveAllObjects();
...
ImageEnVect1.ObjPenWidth[-1] := 4;
ImageEnVect1.AddNewObject(iekBOX, myRect, clRed);