C#水印

 1        base.Response.ContentType = "image/jpeg";
 2        Bitmap image = new Bitmap(Server.MapPath("2008-12-31.jpg"));
 3        Bitmap waterImage = new Bitmap(Server.MapPath("74.png"));
 4
 5        Graphics graphics = Graphics.FromImage(image);
 6        graphics.InterpolationMode = InterpolationMode.High;
 7        graphics.SmoothingMode = SmoothingMode.HighQuality;
 8        ImageAttributes imageatta = new ImageAttributes();
 9        ColorMap colorMap = new ColorMap();
10        colorMap.OldColor = Color.FromArgb(225, 0, 225, 0);
11        colorMap.NewColor = Color.FromArgb(0, 222, 0, 0);
12        waterImage.Dispose();