i first display tiff or other kind of document with a .net tiff application, and then use the following sample codes to insert tiff image,
// <summary>
/// Add an image to TIFFPage
/// </summary>
/// <param name="page"></param>
/// <param name="img"></param>
/// <param name="x"></param>
/// <param name="y"></param>
public void AddImageToPage(TIFFPage page, REImage img, float x, float y)
{
page.AddImage(img, x, y);
}
may it helps you.