Use a TIB_DSQL component instead of a TIB_Query component if is all you are
doing is inserts.
Take a look at the BlobInserts sample application for an example of how to
do parameterized inserting of Blob columns.

Params[n] are a TIB_Column and it supports doing an Assign( s: TStream ) and
then you just call the ExecSQL method after assigning all the blob contents
and other parameter values.

MyDSQL.Prepare;
MyDSQL.ParamByName( 'ACOL1' ).AsInteger := <some val>;
MyDSQL.ParamByName( 'ACOL2' ).Assign( <some stream> );
MyDSQL.ExecSQL;

HTH,
Jason Wharton
www.ibobjects.com