private void bttTonalidad_Click(object sender, EventArgs e)
        {
            EscalaDeGrises escalaDeGrises = new EscalaDeGrises(2);

            escalaDeGrises.Show();
        }
        private void bttLuminosidad_Click(object sender, EventArgs e)
        {
            EscalaDeGrises escalaDeGrises = new EscalaDeGrises(3);

            escalaDeGrises.Show();
        }
        private void bttPromedio_Click(object sender, EventArgs e)
        {
            EscalaDeGrises escalaDeGrises = new EscalaDeGrises(1);

            escalaDeGrises.Show();
        }