Writing Semi-Transparent Text in C#

<%@ Page Language="c#"%>
<script language="c#" runat="server">
private void Page_Load(object sender, System.EventArgs e) {
	//Create Bitmap object
	Aurigma.GraphicsMill.Bitmap bitmap = new Aurigma.GraphicsMill.Bitmap();
	bitmap.LoadFromFile(Server.MapPath("mountain.jpg"));

	bitmap.Graphics.Engine = Aurigma.GraphicsMill.DrawingEngine.DrawingEngineGdiplus;
	bitmap.Graphics.Antialiasing = true;

	//Adjust font settings
	bitmap.Graphics.TextFormat.FontSize = 40;
	bitmap.Graphics.TextFormat.FontName = "Verdana";
	bitmap.Graphics.TextFormat.IsBold = true;
	bitmap.Graphics.TextFormat.IsItalic = false;
	bitmap.Graphics.TextFormat.IsUnderlined = true;
	
	//Create semi-transparent red color using System.Drawing
	//bitmap.Graphics.TextFormat.FontColor = 
	//	System.Drawing.Color.FromArgb(60, System.Drawing.Color.Red).ToArgb();
	
	//Create semi-transparent red color using Graphics Mill
	bitmap.Graphics.TextFormat.FontColor = 
		bitmap.color.CreateArgb(60, 255, 0, 0);

		
	bitmap.Graphics.TextFormat.HorizontalAlignment = 
		Aurigma.GraphicsMill.HorizontalAlignment.HorizontalAlignmentCenter;

	bitmap.Graphics.DrawText("Aurigma", 150, 0, 0); 

	bitmap.Formats.SelectCurrent("PNG");

	//bitmap.SaveToFile(Server.MapPath("temp/result.png"));
	Response.ContentType = "image/jpeg";
	Response.BinaryWrite((byte[])bitmap.SaveToMemory());
}