C# Create Gradient Image

using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;

public static void OutputGradientImage()
{
    using (Bitmap bitmap = new Bitmap(100, 100)) // 100x100 pixels
    using (Graphics graphics = Graphics.FromImage(bitmap))
    using (LinearGradientBrush brush = new LinearGradientBrush(
        new Rectangle(0, 0, 100, 100),
        Color.Blue,
        Color.Red,
        LinearGradientMode.Vertical))
    {
        brush.SetSigmaBellShape(0.5f);
        graphics.FillRectangle(brush, new Rectangle(0, 0, 100, 100));
        bitmap.Save("gradientImage.jpg", ImageFormat.Jpeg);
    }
}