classify is a routine that examines the contents of a catalogue generated by imcore and works out a classification for each individual object. It also works out the aperture corrections, seeing and mean ellipticity header values. Normally classify is run automatically when the catalogue is created with imcore. This standalone version has been included so that it can be re-run in the event that the catalogue has been modified in some way, e.g. by using grout. Any pre-existing classification information in the input catalogue will be overwritten.