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Convert PDF to Black and White Excluding some page - C#

PDF Extractor SDK sample in C# demonstrating ‘Convert PDF to Black and White Excluding some page’

using System.Diagnostics;
using Bytescout.PDFExtractor;

namespace MakeUnsearchablePDF
    class Program
        static void Main()
            // Create Bytescout.PDFExtractor.UnsearchablePDFMaker instance
            UnsearchablePDFMaker unsearchablePDFMaker = new UnsearchablePDFMaker();
            unsearchablePDFMaker.RegistrationName = "demo";
            unsearchablePDFMaker.RegistrationKey = "demo";

            // Load sample PDF document

            //maker.ImageFormat = EmbeddedImageFormat.JPEG; // use JPEG for smaller PDF file, but be ready to compression artefacts
            //maker.JPEGQuality = 75; // JPEG quality (1 - 100)
            unsearchablePDFMaker.RenderingResolution = 300; // larger resolution - longer processing and larger PDF file size

            // Enable Black and White Mode
            unsearchablePDFMaker.Grayscale = true;

            // Enable skipping black and white conversation of pages in range
            unsearchablePDFMaker.KeepSkippedPages = true;

            // "ranges" param is comma-separated list of page ranges in form "1-4,5,7,8-15,16-". 
            // Pages covered by it will be converted to Black and White.
            // Page numbers are 1-based. Ending "-" means "to the last page".
            // You can also use inverted page numbers adding '!' before the number. E.g. "!1" means "the last page", 
            // "2-!2" means "from the second to the penultimate page", "!2-" - last two pages
            unsearchablePDFMaker.MakePDFUnsearchable("result.pdf", ranges: "1");

            // Cleanup

            // Open the result PDF file in default associated application
            ProcessStartInfo processStartInfo = new ProcessStartInfo("result.pdf");
            processStartInfo.UseShellExecute = true;

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