[Lazarus] How to create a transparent PNG?

[Gabor Boros]

Hi All,

I want to draw onto a PNG image and save it without background. Tried 
Transparent, TransparentColor, TransparentMode properties without 
success. I need the A character in the PNG with black color without 
background. Any idea?

procedure PNG;
var
  P:TPortableNetworkGraphic;
begin
  P:=TPortableNetworkGraphic.Create;
  P.SetSize(20,20);
  P.Canvas.TextOut(0,0,'A');
  P.SaveToFile('TEST.PNG');
  P.Free;
end;

Gabor

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