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// For complete examples and data files, please go to https://github.com/groupdocs-watermark/GroupDocs.Watermark-for-.NET
using (CellsDocument doc = Document.Load<CellsDocument>(Utilities.MapSourceFilePath (FilePath)))
{
    foreach (CellsWorksheet worksheet in doc.Worksheets)
    {
        if (worksheet.BackgroundImage != null)
        {
            Console.WriteLine(worksheet.BackgroundImage.Width);
            Console.WriteLine(worksheet.BackgroundImage.Height);
            Console.WriteLine(worksheet.BackgroundImage.GetBytes().Length);
        }
    }
}