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   procedure convertPDFtoTIFF();
   var
     DC : Variant;
     RVal : Integer;
     docToConvert : String;
   begin
     docToConvert := 'c:\users\public\test.pdf';

     try
       DC := CreateOleObject('Neevia.docCreator');

       DC.setParameter('DocumentOutputFormat', 'TIFF');
       DC.setParameter('DocumentOutputName', 'testTIFF_Delphi');
       DC.setParameter('DocumentOutputFolder', 'c:\users\public\');

       DC.setParameter('TIFFType', 'tiff24lzw');

       DC.setParameter('DocumentResolution', '150');

       DC.setParameter('MPTiff', 'True');

       DC.setInputDocument(docToConvert);
       RVal := DC.create;
       if (RVal <> 0) then
          ShowMessage('Error while creating document!!! Code: '+IntToStr(RVal))
       else
          ShowMessage('Document Created !!!');
     finally
       DC := Unassigned;
     end;
   end;