I previously had a long exchange with expert Joe Winograd regarding converting PDFs to TIFs and combining multiple TIFs to one multi-page TIF within a VFP program.
Joe had suggested Irfanview with Ghostscript to accomplish this, and it tested great! I now have to put these things into a real system and am having problems that seem to be due to Ghostscript not being found, even though there is a statement in the i_view32.ini file pointing to the Ghostscript DLL. This is due to the PDF not being converted, it creates an invalid TIF file. TIF to TIF works.