Download Images with RenditionID

Hello,

I am able to download Images from SPO using code given below. My question is how to maintain the original size of the image which is mentioned in URL. (RenditionID=5 in my case)

public static void DownoadFile(string FilePath,string DestinationPath)
        {
            //Filepath parameter to be passed below
            Uri filename = new Uri(@"https://mysiteurl.com/Sites/PublishingImages/2016/Test.jpg?RenditionID=6");
            string server = filename.AbsoluteUri.Replace(filename.AbsolutePath, "");
            string serverrelative = filename.AbsolutePath;

            ClientContext clientContext = new ClientContext("https://mysiteurl.com/Sites/");
            clientContext.Credentials = GetO365Credentials(ConfigurationManager.AppSettings["username"], ConfigurationManager.AppSettings["password"]);
            FileInformation f = Microsoft.SharePoint.Client.File.OpenBinaryDirect(clientContext, serverrelative);

            //DestinationPath parameter to be used below
            using (var fileStream = new FileStream(@"c:\Test.jpg", FileMode.Create))
                f.Stream.CopyTo(fileStream);
        }

		public static SharePointOnlineCredentials GetO365Credentials(string userName, string passWord)
        {
            SecureString securePassWord = new SecureString();
            foreach (char c in passWord.ToCharArray()) securePassWord.AppendChar(c);
            SharePointOnlineCredentials credentials = new SharePointOnlineCredentials(userName, securePassWord);
            return credentials;
        }