create or replace function bytea_import(p_path text, p_result out bytea) 
                   language plpgsql as $$
declare
  l_oid oid;
  r record;
begin
  p_result := '';
  select lo_import(p_path) into l_oid;
  for r in ( select data 
             from pg_largeobject 
             where loid = l_oid 
             order by pageno ) loop
    p_result = p_result || r.data;
  end loop;
  perform lo_unlink(l_oid);
end;$$;[/SUP]

Теперь пытаюсь записать при помощи нее jpeg файл:
INSERT INTO "Images"("Image")
    values (select bytea_import('c:/1.jpeg'));

INSERT INTO "Images"("Image")
    values (select bytea_import('c:/1.jpeg'));

INSERT into "Images" ("Image) VALUES (:param)