The transition from analogue, film-based detection methods to digital ones in the middle of the last decade of last century can be evaluated as a real “revolution” from the present point of view. We describe the main features of the detection processes in the neutron imaging and analyze which are the critical components for the different applications. In the outlook, we focus on the energy-selection by means of time-of-flight approaches and the options for single-event imaging with the suitable detection systems.