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procedure TForm1.FormPaint(Sender: TObject);
var
  x, y: integer;
  bm: TBitMap;
begin
  Form1.ClientWidth := 200;
  Form1.ClientHeight := 100;
  randomize;
  for x := 0 to 199 do
    for y := 0 to 99 do
      if random(3) = 1 then
        Form1.Canvas.Pixels[x,y] := clGreen
      else
        Form1.Canvas.Pixels[x,y] := clLime;
  bm := TBitMap.Create;
  bm.Width := 200;
  bm.Height := 100;
  with bm.Canvas do
  begin
    Brush.Color := clGreen;
    FillRect(ClipRect);
    Font.name := 'Arial';
    Font.Size := 50;
    Font.Color := clGray;
    Font.Style := [fsBold];
    TextOut((bm.Width - TextWidth('Text')) div 2,
    (bm.Height - TextHeight('Text')) div 2, 'Text');
  end;
  Form1.Canvas.CopyMode := cmSrcPaint;
  Form1.Canvas.CopyRect(bm.Canvas.ClipRect, bm.Canvas,
  bm.Canvas.ClipRect);
  bm.Destroy;
end;

Взято с https://delphiworld.narod.ru