http://www.dotblogs.com.tw/puma/archive/2008/03/31/2363.aspx

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;
using System.Drawing.Imaging;

public partial class imageprocess : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Bitmap b = new Bitmap(Server.MapPath("f6.jpg"));

for (int x = 0; x < style="margin-top: 0em; margin-right: 0em; margin-bottom: 0em; margin-left: 0em; padding-top: 0em; padding-right: 0em; padding-bottom: 0em; padding-left: 0em; "> {
for (int y = 0; y < style="margin-top: 0em; margin-right: 0em; margin-bottom: 0em; margin-left: 0em; padding-top: 0em; padding-right: 0em; padding-bottom: 0em; padding-left: 0em; "> {

Color pixel = b.GetPixel(x, y);


int val = (pixel.R+pixel.G+pixel.B)/3;



b.SetPixel(x, y, Color.FromArgb(val,val,val));

}
}

b.Save(Server.MapPath("Newf6.jpg"));

}
}
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