Document doc = new Document("f:\\333.doc");
ImageSaveOptions iso = new ImageSaveOptions(SaveFormat.Jpeg);
            iso.Resolution = 128;
            iso.PrettyFormat = true;
            iso.UseAntiAliasing = true;
            for (int i = 0; i < doc.PageCount; i++)
            {
                iso.PageIndex = i;
                doc.Save("D:/test/test" + i + ".jpg", iso);
            }