Whenever an event
is either recorded (audio) or filmed (video
), post-processing is the process
by which the material is edited
d, and otherwise modified so that the result
is closer to what the producer
Some examples of post-processing are wipes (video), dissolves (video and film), QSound (audio), mixing (usually audio, but sometimes video editing is referred to as mixing as well), equalizing (audio), color correcting (video and film), colorization (black and white film or video; some people hate this }:) ), and so on.
It would probably take several megabytes to explain all these different types of post-processing; I have left them as hard-links so any future noders who are in these fields can add their knowledge.