VB.NET TIFF - Convert TIFF to PDF Using VB.NET

'API for rendering TIFF to get a REImage collection
Private Function GetPage(pageIdx As Integer) As BasePage Implements TIFFDocument.GetPage
End Function
Private Function toImage() As BaseImage Implements TIFFPage.toImage
End Function
Private Function toImage(width As Integer, height As Integer) As BaseImage Implements TIFFPage.toImage
End Function
Private Sub New(imagesource As List(Of REImage))
End Sub

' API for converting TIFF file to PDF
Private Sub Convert(s As Stream, format As ImageFormat) Implements REImage.Convert
End Sub

''' <summary>
''' Convert TIFF to PDF through REImage 
''' </summary>
''' <param name="TiffFilePath"></param>
''' <returns></returns>
Public Function ConvertTIFFtoPDF(TiffFilePath As [String]) As PDFDocument
   Dim doc As New TIFFDocument(TiffFilePath)

   Dim imageBuffer As New List(Of REImage)()

   For i As Integer = 0 To doce.GetPageCount() - 1
      Dim page As TIFFPage = DirectCast(doc.GetPage(i), TIFFPage)

      imageBuffer.Add(DirectCast(page.ToImage(), REImage))
   Next

   ' Create a PDFDocument using the REImage you get from TIFFDocument

   Return PDFDocument(imageBuffer)
End Function