How to convert entire Excel workbook into TIFF image?

using (ExcelEngine excelEngine = new ExcelEngine())
{
    IApplication application = excelEngine.Excel;
    application.DefaultVersion = ExcelVersion.Xlsx;
    application.XlsIORenderer = new XlsIORenderer();
 
    FileStream fileStream = new FileStream("../../../Data/ExportData.xlsx", FileMode.Open, FileAccess.Read);
    IWorkbook workbook = application.Workbooks.Open(fileStream);
    fileStream.Dispose();
 
    var outputStream = new MemoryStream();
    using (MagickImageCollection magicImageCollection = new MagickImageCollection())
    {
        foreach (IWorksheet sheet in workbook.Worksheets)
        {
            Stream stream = new MemoryStream();
            IRange used = sheet.UsedRange;
            ExportImageOptions exportImageOptions = new ExportImageOptions();
            exportImageOptions.ScalingMode = ScalingMode.Normal;
            exportImageOptions.ImageFormat = ExportImageFormat.Png;
            sheet.ConvertToImage(used.Row, used.Column, used.LastRow, used.LastColumn, exportImageOptions, stream);
            stream.Position = 0;
 
            MagickImage magickImage = new MagickImage(stream);
            magickImage = CompressImage(magickImage, 10);
            magicImageCollection.Add(magickImage);
        }
        var outputData = magicImageCollection.ToByteArray(MagickFormat.Tif);
        outputStream.Write(outputData, 0, outputData.Length);
    }
    File.WriteAllBytes("Output.tiff", outputStream.ToArray());
}
 
static MagickImage CompressImage(MagickImage image, int quality)
{
    MagickImage newMagickImage= null;
    using (MemoryStream memoryStream1 = new MemoryStream())
    {
        image.Quality = quality;
        image.Write(memoryStream1, MagickFormat.Png);
        memoryStream1.Position = 0;
        ImageOptimizer imageOptimizer = new ImageOptimizer();
        imageOptimizer.LosslessCompress(memoryStream1);
        memoryStream1.Position = 0;
        newMagickImage = new MagickImage(memoryStream1);
    }
 
    return newMagickImage;
}