Cambiar tamaño de imagen (thumbail)

[wwwmaster]

Si puedes usar ambas no importa, con tal que el hosting tenga configurado el .net. , yo he probado el thumbnailer que puede generarse con .net y es realmente eficaz.
El code va mas o menos asi:

<%@ Page Language="C#" ContentType="text/html" ResponseEncoding="iso-8859-1" %>
<script language="C#" runat="server">
void Page_Load(Object sender, EventArgs e)
{
try{
Response.Cache.VaryByParams["Image;Width;Height;ForceAspect"] = true;
Response.ContentType = "image/jpeg";
System.Collections.Hashtable imageOutputFormatsTable = new System.Collections.Hashtable();
imageOutputFormatsTable.Add(System.Drawing.Imaging .ImageFormat.Gif.Guid, System.Drawing.Imaging.ImageFormat.Gif);
imageOutputFormatsTable.Add(System.Drawing.Imaging .ImageFormat.Jpeg.Guid, System.Drawing.Imaging.ImageFormat.Jpeg);
imageOutputFormatsTable.Add(System.Drawing.Imaging .ImageFormat.Bmp.Guid, System.Drawing.Imaging.ImageFormat.Gif);
imageOutputFormatsTable.Add(System.Drawing.Imaging .ImageFormat.Tiff.Guid, System.Drawing.Imaging.ImageFormat.Jpeg);
imageOutputFormatsTable.Add(System.Drawing.Imaging .ImageFormat.Png.Guid, System.Drawing.Imaging.ImageFormat.Jpeg);

string imageLocation;
bool forceaspect = true;
int newHeight;
int newWidth;
int reqHeight = 100;
int reqWidth = 100;
int origHeight;
int origWidth;

imageLocation = Server.MapPath(Request.QueryString["Image"]);
if (Request.QueryString["Height"] != null){
reqHeight = Convert.ToInt32(Request.QueryString["Height"]);
}
if (Request.QueryString["ForceAspect"] != null){
forceaspect = Convert.ToBoolean(Request.QueryString["ForceAspect"]);
}
if(Request.QueryString["Width"] != null){
reqWidth = Convert.ToInt32(Request.QueryString["Width"]);
}
if (Request.QueryString["ForceAspect"] == "true"){
forceaspect = true;
}

System.Drawing.Bitmap origBitmap = new System.Drawing.Bitmap(imageLocation);
origHeight = origBitmap.Height;
origWidth = origBitmap.Width;

if (forceaspect){
//Force Aspect Change
newHeight = reqHeight;
newWidth = reqWidth;
}
else if (origBitmap.Height >= origBitmap.Width){
//Portrait
newHeight = reqHeight;
newWidth = (int)(((double)origBitmap.Width / (double)origBitmap.Height) * reqHeight);
}
else{
//Landscape
newWidth = reqWidth;
newHeight = (int)(((double)origBitmap.Height / (double)origBitmap.Width) * reqWidth);
}

System.Drawing.Bitmap outputImage = new System.Drawing.Bitmap(origBitmap, newWidth, newHeight);
outputImage.SetResolution(24, 24);

//outputImage.InterpolationMode = InterpolationMode.HighQualityBicubic;
System.Drawing.Imaging.ImageFormat outputFormat = (System.Drawing.Imaging.ImageFormat)imageOutputFor matsTable[origBitmap.RawFormat.Guid];

outputImage.Save(Response.OutputStream, outputFormat);
outputImage.Dispose();
origBitmap.Dispose();
}
catch{
Response.Redirect("galleryImages/thumberror.gif");
}
}
</script>