【C#エクセル】画像をエクセルにドット絵で描画する

private void SetCellSize(Microsoft.Office.Interop.Excel.Worksheet worksheet, int maxRows, int maxCols, double width, double height)
{
    Microsoft.Office.Interop.Excel.Range range = worksheet.Range[worksheet.Cells[1, 1], worksheet.Cells[maxRows, maxCols]];
    range.RowHeight = height;
    range.ColumnWidth = width;
}


private Bitmap ResizeImageToFit(Bitmap originalImage, int maxWidth, int maxHeight)
{
    if (originalImage.Width <= maxWidth && originalImage.Height <= maxHeight)
        return originalImage;

    float ratioX = (float)maxWidth / originalImage.Width;
    float ratioY = (float)maxHeight / originalImage.Height;
    float ratio = Math.Min(ratioX, ratioY);

    int newWidth = (int)(originalImage.Width * ratio);
    int newHeight = (int)(originalImage.Height * ratio);

    Bitmap newImage = new Bitmap(newWidth, newHeight);
    using (Graphics graphics = Graphics.FromImage(newImage))
    {
        graphics.DrawImage(originalImage, 0, 0, newWidth, newHeight);
    }

    return newImage;
}


private void button1_Click(object sender, EventArgs e)
{
    string imagePath = @"C:\GPTで暇つぶし\キザル.png";
    ConvertImageToExcel(imagePath);
     // 処理が完了したら、メッセージボックスを表示
    MessageBox.Show("画像の描画が完了しました！", "完了", MessageBoxButtons.OK, MessageBoxIcon.Information);
     // プログレスバーの値を0にリセット
    progressBar1.Value = 0;
}

private void ConvertImageToExcel(string imagePath)
{
    var excelApp = new Microsoft.Office.Interop.Excel.Application();
    var workbook = excelApp.Workbooks.Add();
    var worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];

    using (Bitmap originalBitmap = new Bitmap(imagePath))
    {
        int maxRows = 150;  // これは調整可能です
        int maxCols = 150;  // これも調整可能です

        // セルのサイズを調整
        SetCellSize(worksheet, maxRows, maxCols, 0.5, 5);  // 幅と高さは調整可能です

        using (Bitmap resizedBitmap = ResizeImageToFit(originalBitmap, maxCols, maxRows))
        {
            progressBar1.Maximum = resizedBitmap.Height;
            progressBar1.Value = 0;

            for (int y = 0; y < resizedBitmap.Height; y++)
            {
                for (int x = 0; x < resizedBitmap.Width; x++)
                {
                    Color pixelColor = resizedBitmap.GetPixel(x, y);
                    var cell = (Microsoft.Office.Interop.Excel.Range)worksheet.Cells[y + 1, x + 1];
                    cell.Interior.Color = System.Drawing.ColorTranslator.ToOle(pixelColor);
                }
                progressBar1.Value = y + 1;
                Application.DoEvents();
            }
        }
    }

    excelApp.Visible = true;
}