Sorry, I forget to tell
I am using Teechart VCL 8.06 trial.

Hi: I just write a simple program. It is fine to using GDIPlus to smooth te edge. But when I add the red line code want to output to bitmap file. Error happened. procedure TForm1.Button1Click(Sender: TObject); var g:TGDIPlusCanvas; begin g:=TGDIPlusCanvas.Create; PieChart.Canvas:=g; g.AntiAlias:=Tru...