examples for JPEG SPIFF (Still Picture Interchange File Format) variant

[jenderek]

Hello trid users,

some days ago i handles some JPEG images with unusual 3 byte file name
extension "THM" instead of usual JPG or JPEG extension.

So i looked for more unusual JPEG variants. One variant is called Still
Picture Interchange File Format (SPIFF) with filename extension like
SPF or SPIFF.

When searching the net i found many specification information, but i
found no examples or software that can explicitly create such
variants (Or i am to stupid to use the right search terms).

So thanks for tips and/or examples.

Jörg Jenderek