Title: How to convert TIF to PDF
Question: You have a multipage TIF file, that you want to convert to a PDF file. 
How do you do that?
Answer:
To use this function, you need a full license/version of Adobe Acrobat. I've tested this function with Adobe Acrobat 4.0.
First you need to import the Acrobat AxtiveX control.
1) Select Component - Import ActiveX Control
2) Select Acrobat Controle for ActiveX and click install
3) Chose a package to install the ActiveX control into
4) Put PDFlib_tlb in your uses clauses. The file is in the Borland\Delphi5\Imports directory.
How to use the function
Here's an example of using the function:
if not TifToPDF('c:\test.tif', 'c:\test.pdf') then Showmessage('Could not convert');
The TifToPdf function
function TifToPDF(TIFFilename, PDFFilename: string): boolean;
var
 AcroApp : variant;
 AVDoc : variant;
 PDDoc : variant;
 IsSuccess : Boolean;
begin
 result := false;
 if not fileexists(TIFFilename) then exit;
 try
 AcroApp := CreateOleObject('AcroExch.App');
 AVDoc := CreateOleObject('AcroExch.AVDoc');
 AVDoc.Open(TIFFilename, '');
 AVDoc := AcroApp.GetActiveDoc;
 if AVDoc.IsValid then
 begin
 PDDoc := AVDoc.GetPDDoc;
 PDDoc.SetInfo ('Title', '');
 PDDoc.SetInfo ('Author', '');
 PDDoc.SetInfo ('Subject', '');
 PDDoc.SetInfo ('Keywords', '');
 result := PDDoc.Save(1 or 4 or 32, PDFFilename);
 PDDoc.Close;
 end;
 AVDoc.Close(True);
 AcroApp.Exit;
 finally
 VarClear(PDDoc);
 VarClear(AVDoc);
 VarClear(AcroApp);
 end;
end;