OpenXML - există o modalitate de a elimina eliminare caracteristică a Microsoft Word watermark?

Atunci când adăugarea unui filigran la antet de document word, se adaugă automat opacitatea la ea. Vreau să elimina acest opacitate și la verificarea pe Microsoft Word în sine, am aflat că acesta poate fi eliminat prin debifarea Eliminare opțiune. Acest lucru poate fi eliminat folosind OpenXML?

Am urmat filigranare codurile de mai jos:

using System.IO;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Wordprocessing;
using DocumentFormat.OpenXml;
using V = DocumentFormat.OpenXml.Vml;
using System.Diagnostics;

namespace WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            using (WordprocessingDocument package = WordprocessingDocument.Open(@"C:\Users\*****\****.docx", true))
            {
                InsertCustomWatermark(package, @"C:\Users\*******\****.jpg");
            }
        }

        private void InsertCustomWatermark(WordprocessingDocument package, string p)
        {
            SetWaterMarkPicture(p);
            MainDocumentPart mainDocumentPart1 = package.MainDocumentPart;
            if (mainDocumentPart1 != null)
            {
                mainDocumentPart1.DeleteParts(mainDocumentPart1.HeaderParts);
                HeaderPart headPart1 = mainDocumentPart1.AddNewPart<HeaderPart>();
                GenerateHeaderPart1Content(headPart1);
                string rId = mainDocumentPart1.GetIdOfPart(headPart1);
                ImagePart image = headPart1.AddNewPart<ImagePart>("image/jpeg", "rId999");
                GenerateImagePart1Content(image);
                IEnumerable<SectionProperties> sectPrs = mainDocumentPart1.Document.Body.Elements<SectionProperties>();
                foreach (var sectPr in sectPrs)
                {
                    sectPr.RemoveAllChildren<HeaderReference>();
                    sectPr.PrependChild<HeaderReference>(new HeaderReference() { Id = rId });
                }
            }
            else
            {
                MessageBox.Show("alert");
            }
        }
        private void GenerateHeaderPart1Content(HeaderPart headerPart1)
        {
            Header header1 = new Header();
            Paragraph paragraph2 = new Paragraph();
            Run run1 = new Run();
            Picture picture1 = new Picture();
            V.Shape shape1 = new V.Shape() { Id = "WordPictureWatermark75517470", Style = "position:absolute;left:0;text-align:left;margin-left:0;margin-top:0;width:415.2pt;height:456.15pt;z-index:-251656192;mso-position-horizontal:center;mso-position-horizontal-relative:margin;mso-position-vertical:center;mso-position-vertical-relative:margin", OptionalString = "_x0000_s2051", AllowInCell = false, Type = "#_x0000_t75" };
            V.ImageData imageData1 = new V.ImageData() { Gain = "19661f", BlackLevel = "22938f", Title = "水印", RelationshipId = "rId999" };
            shape1.Append(imageData1);
            picture1.Append(shape1);
            run1.Append(picture1);
            paragraph2.Append(run1);
            header1.Append(paragraph2);
            headerPart1.Header = header1;
        }
        private void GenerateImagePart1Content(ImagePart imagePart1)
        {
            System.IO.Stream data = GetBinaryDataStream(imagePart1Data);
            imagePart1.FeedData(data);
            data.Close();
        }
        private string imagePart1Data = "";
        private System.IO.Stream GetBinaryDataStream(string base64String)
        {
            return new System.IO.MemoryStream(System.Convert.FromBase64String(base64String));
        }
        public void SetWaterMarkPicture(string file)
        {
            FileStream inFile;
            byte[] byteArray;
            try
            {
                inFile = new FileStream(file, FileMode.Open, FileAccess.Read);
                byteArray = new byte[inFile.Length];
                long byteRead = inFile.Read(byteArray, 0, (int)inFile.Length);
                inFile.Close();
                imagePart1Data = Convert.ToBase64String(byteArray, 0, byteArray.Length);
            }
            catch (Exception ex)
            {
                Debug.Print(ex.Message);
            }
        }
    }
}