private void buttonNext_Click(object sender, EventArgs e)
{
if ((textBoxGamma.Text != String.Empty) && (textBoxGamma.Text != "0"))
{
ImageForm image = new ImageForm();
image.MdiParent = this.MdiParent;
image.Gamma(Convert.ToDouble(textBoxGamma.Text), bmp_);
image.Show();
}
}