It appears that several JPEG to PFI conversions are possible, both represent a transformation of generic JPEG pictures to a program specific format that has pfi extension, used by Panorama Factory and PhotoFiltre Studio. Except for sharing same file extensions, these conversions are unrelated.
Found 2 different conversion types using the same filename extensions.
Conversion jpeg to pfi type 1:
Convert from JPEG bitmap image format to Panorama Factory bitmap image file.
Apple macOS / Mac OS X software - convert jpeg to pfi on OS X
Panorama Factory for Mac is photo editor used to create panorama pictures. It Includes a library of over 800 digital camera models including digital SLRs.
File type (from-> to)
Convert from jpeg file
JPEG bitmap image format
to pfi file
Panorama Factory bitmap image file
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned jpeg to pfi. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Conversion jpeg to pfi type 2:
Convert from JPEG bitmap image format to PhotoFiltre Studio image file.
Microsoft Windows software - convert jpeg to pfi on Windows
PhotoFiltre Studio is a complete image retouching program. It allows users to do simple or advanced adjustments to any image or photograph and apply a vast range of filters on it.