post-production

US /ˈpoʊst.prəˌdʌk.ʃən/
UK /ˈpoʊst.prəˌdʌk.ʃən/
"post-production" picture
1.

the stages of film, video, or audio production that occur after the actual shooting or recording has been completed, including editing, special effects, and sound mixing

:
The film is currently in post-production, with editing expected to take several months.
Effective post-production can significantly enhance the quality of a raw recording.