Thank you for the support offer Ann.

We looked into EmbedSQL.pdf of the documentation because it is the
only spot that mentiones BLOB filters in detail.

Regardless of how to actually write our own filter, I would like to
know how to access it from the client application. Remember, the
client is Crystal Reports via ODBC, so the examples with DECLARE
CURSOR, etc won't work here.

Will BLOB filters permit to either write an SQL SELECT on the
filtered BLOB directly or (better) make a VIEW that returns
the "filtered" (I would rather call them "converted") data?
If yes, how would it look like? If no, we are running out of options
here.

Mirco