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  held_oben1 := TPicture.Create;
  held_oben1.LoadFromFile('source\grafiken\figuren\held\held_oben1.jpg');					

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buffer.Canvas.Draw(x_positionHeld, y_positionHeld, held_links2.Graphic);					

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Procedure DrawTransparent(DestCanvas:TCanvas;Graphic:TGraphic;Color:TColor);
var
  bmp:TBitmap;
begin
 bmp:=TBitmap.Create;
 try
 bmp.Width := Graphic.Width;
 bmp.Height := Graphic.Height;
 bmp.Canvas.Draw(0,0,Graphic);
 bmp.TransparentColor := Color;
 bmp.Transparent := true;
 DestCanvas.Draw(0,0,bmp);
 finally
 bmp.Free;
 end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
 image1.Picture.LoadFromFile('C:\bilder\h2o.jpg');
 DrawTransparent( Canvas, Image1.Picture.Graphic, clWhite);
end;