Photographer
In The Truth, William de Worde learns from Otto Chriek that this is an old Latatian title derived from the word "photus" roughly meaning to prance around like a pillock ordering everyone about as if you owned the place.
It is apparently cognate with the more accepted Ephebian term iconographer.
The term is even known on Roundworld, as Jeremy the Thumb appears to be a classic example of the type.