PDFDoc doc = new PDFDoc(filename)
Page page = doc.GetPage(1);

ElementWriter writer = new ElementWriter();
ElementReader reader = new ElementReader();
reader.Begin(page);
writer.Begin(page, ElementWriter.WriteMode.e_replacement, false);

Element element;
while ((element = reader.Next()) != null) // Read page contents
{
    switch (element.GetType())
    {
        case Element.Type.e_image:
        case Element.Type.e_inline_image:
            // remove all images by skipping them
            continue;
        default:
            writer.WriteElement(element);
            break;
    }
}

writer.End();
reader.End();