//in my class
    private const float EoPdfDefaultDpi = 96;


    //simplified extract of method code
            //calculate the multiplier
            float multiplier = dpi / EoPdfDefaultDpi;    

            //Start with an A4 page, but then blow it up to be bigger
            var pageSize = PdfPageSizes.A4;
            pageSize = new SizeF(pageSize.Width * 3, pageSize.Height * 3);
            //Create output area - have half inch margin top & bottom plus another half inch at the top... Also have 1.0" at right
            var outputRect = (new RectangleF(0, 0.5f, pageSize.Width - 1.0f, pageSize.Height - 1.5f));

            var options = new HtmlToPdfOptions()
            {
                PageSize = pageSize,
                AutoFitX = HtmlToPdfAutoFitMode.None,
                AutoFitY = HtmlToPdfAutoFitMode.None,
                ZoomLevel = (float)Math.Pow(pageSize.Height / pageSize.Width, multiplier),
                AllowLocalAccess = true,
                AutoAdjustForDPI = false,
                OutputArea = outputRect,
                GeneratePageImages = true,
                PreserveHighResImages = true
            };
            
            var dummyPdfDoc = new PdfDocument();

            var result = HtmlToPdf.ConvertUrl(url, dummyPdfDoc, options);
            
            for (int i = 0; i < result.pageImages.Length; i++)  
            {
               var pageImage = result.pageImages[imageIndex];

               var clonedImage = (Bitmap)pageImage.Clone();

               clonedImage.SetResolution(clonedImage.HorizontalResolution * multiplier, clonedImage.VerticalResolution * multiplier);

               //go do something with the cloned image
               //.....

               //  (aside: in my other support thread, it's at this point in the code that I'm wondering if I should call pageImage.Dispose();)
            }