source/WBI/dynimage.ashx

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+<%@ WebHandler Language="C#" Class="dynimage" %>
+
+using System;
+using System.Web;
+using System.Drawing;
+using System.Drawing.Imaging;
+using System.IO;
+public class dynimage : IHttpHandler
+{
+
+    public void ProcessRequest(HttpContext context)
+    {
+
+        string imagetype = context.Request.QueryString["t"];
+        switch (imagetype)
+        {
+            case "flag":
+                {
+
+                    Bitmap source = new Bitmap(context.Server.MapPath("~/graphics/FlagBlack16.png"));
+
+                    int ARGB = int.Parse(context.Request.QueryString["argb"]);
+                    Color NewColor = Color.FromArgb(ARGB);
+                    swapcolor(Color.FromArgb(255, 0, 0, 0), NewColor, source);
+
+                    context.Response.Clear();
+                    context.Response.ContentType = "image/png";
+
+                    using (MemoryStream stream = new MemoryStream())
+                    {
+                        source.Save(stream, ImageFormat.Png);
+
+                        stream.WriteTo(context.Response.OutputStream);
+                    }
+
+
+                }
+                break;
+        }
+    }
+
+
+    public bool IsReusable {get{return false;}}
+    protected void swapcolor(Color oldColor, Color newColor, Bitmap baseImage)
+    {
+        if (newColor != oldColor)
+        {
+
+            int width = baseImage.Width;
+            int height = baseImage.Height;
+
+            int i, j;
+            for (i = 0; i < width; i++)
+            {
+                for (j = 0; j < height; j++)
+                {
+                    Color pixelColor = baseImage.GetPixel(i, j);
+
+                    //Replace each all black pixel with the chosen color
+                    if (pixelColor == oldColor)
+                    {
+                        baseImage.SetPixel(i, j, newColor);
+
+                    }
+                }
+            }
+        }
+    }
+}