//This method will demonstrate how to use PDF Xpress to save a PDF document as a PDF/A-1b
//compliant PDF.
//sourceDoc - the Document object for the source "regular" PDF document.
//targetDoc - the new Document we will form with the image of the regular PDF
//and then save as PDF/A-1b.
//iccProfileName - the path to a valid ICC profile.
//imageXObject - ImagXpress object, to be used to compress the page image.
//saveOptions - compression settings to compress the page image.
private void saveAsPDFa1b(Document sourceDoc, 
                          Document targetDoc, 
                          String iccProfileFileName, 
                          ImagXpress imageXObject, 
                          Accusoft.ImagXpressSdk.SaveOptions saveOptions)
{
    //render each page in the source PDF
    for (int page = 0; page < sourceDoc.PageCount; page++)
    {
        //RenderOptions for source PDF page
        RenderOptions sourceRenderOptions = new RenderOptions();
        sourceRenderOptions.RenderAnnotations = false;
        sourceRenderOptions.ProduceDibSection = false;
        sourceRenderOptions.ResolutionX = 100;
        sourceRenderOptions.ResolutionY = 100;
 
        //render the original PDF page to an uncompressed Bitmap
        using(Bitmap pageBMP = sourceDoc.RenderPageToBitmap(page, sourceRenderOptions))
        {
            //NOTE: For optimal file size, compress the Bitmap with ImagXpress 9
            using (ImageX compressImage = ImageX.FromBitmap(imageXObject, pageBMP))
            {
                using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
                {
                    compressImage.SaveStream(ms, saveOptions);
                    ms.Seek(0, System.IO.SeekOrigin.Begin);
 
                    //create a new page in the new Document to be saved as PDF/A-1b
                    PageOptions targetPageOpts = new PageOptions();
                    targetPageOpts.MediaHeight = (compressImage.ImageXData.Height / 
                        compressImage.ImageXData.Resolution.Dimensions.Width) * 72.0;
                    targetPageOpts.MediaWidth = (compressImage.ImageXData.Width /
                        compressImage.ImageXData.Resolution.Dimensions.Height) * 72.0;
                    targetDoc.CreatePage(page - 1, targetPageOpts);
 
                    //add the image of the original PDF page to the Document to be
                    //saved as PDF/A-1b
                    targetDoc.AddImage(page, 0, 0, targetPageOpts.MediaWidth,
                                        targetPageOpts.MediaHeight, ImageFitSettings.None,
                                        ms.ToArray(), 0);
                }
            }
        }
    }
    //specify conversion options
    //specify a valid ICC profile to embed
    ConvertOptions pdfaConvertOptions = new ConvertOptions();
    pdfaConvertOptions.IccProfileFilename = iccProfileFileName;
    pdfaConvertOptions.PdfType = Accusoft.PdfXpressSdk.PdfType.pdfA1b;
 
    try
    {
        //convert the target Document to PDF/A-1b
        targetDoc.ConvertToPdfA(pdfaConvertOptions);
    }
    catch (Accusoft.PdfXpressSdk.PdfXpressException pdfException)
    {
        //a conversion problem was encountered
    }
        //save the new converted PDF/A-1b document
        Accusoft.PdfXpressSdk.SaveOptions targetSaveOptions = 
           new Accusoft.PdfXpressSdk.SaveOptions();
        targetSaveOptions.Filename = "convertedPDFaSampleDoc.pdf";
        targetDoc.Save(targetSaveOptions);
    }
}