怎么经过后台处理 让清晰的图片变得模糊

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.Drawing;using System.Drawing.Imaging;namespace WebTest{    public partial class WebForm5 : System.Web.UI.Page    {        protected void Page_Load(object sender, EventArgs e)        {            Bitmap img = new Bitmap(@"E:\Temp\psu (1).jpg");            SolidBrush pixelBrush;            Graphics g = Graphics.FromImage(img);            for (int i = 0; i < img.Width; i++)            {                            for (int j = 0; j < img.Height; j++)                {                    Color pixelColor = img.GetPixel(i-i%2, j-j%2);                            pixelBrush = new SolidBrush(pixelColor);                    g.FillRectangle(pixelBrush, i, j, 1, 1);                                    }                               }            Response.ContentType = "image/JPEG";            img.Save(Response.OutputStream, ImageFormat.Jpeg);            Response.End();        }    }}
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所有圖像控件都有這小兒科功能