Creates a multipage searchable PDF from a multipage tiff image and performs an OCR recognition. This image can be a read only multipage tiff image or an editable multipage tiff image. The recognized text is written invisibly to the PDF in order to simplify indexing and search. 

For each language of recognition, you have to deploy specific files. See the Dictionary parameter.

public String PdfOCRCreateFromMultipageTIFF(
    int ImageID, 
    TesseractDictionary Dictionary, 
    String DictionaryPath, 
    String CharWhiteList, 
    String FilePath, 
    Boolean PDFA, 
    String Title, 
    String Author, 
    String Subject, 
    String Keywords, 
    String Creator
);

Public Function PdfOCRCreateFromMultipageTIFF(
    ByVal ImageID As Integer, 
    ByVal Dictionary As TesseractDictionary, 
    ByVal DictionaryPath As String, 
    ByVal CharWhiteList As String, 
    ByVal FilePath As String, 
    ByVal PDFA As Boolean, 
    ByVal Title As String, 
    ByVal Author As String, 
    ByVal Subject As String, 
    ByVal Keywords As String, 
    ByVal Creator As String
) As String

The recognized text.