Gamma korrekció végrehajtása

    private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
    {
      Graphics g = e.Graphics;
      ...
      Rectangle r2 = new Rectangle(5, 110, ClientRectangle.Width-10, 100);
      LinearGradientBrush brush2 = new LinearGradientBrush(r2, c1, c2, 135, true);
      brush2.SetBlendTriangularShape(0.5f);           
      brush2.GammaCorrection = true;
      g.FillRectangle(brush2, r2);
      ...
    }