A proof is a proof printed from the last revised printing plate, and sometimes it also refers to a proof that is finally revised and ready for printing.

Film making is the process of making a designed document into film (also called film), which is called film making in printing.

The red dot is the nuclear red, that is, the nuclear red is also called "red right" and "red back", which refers to the proofreading work to check whether the corrections made in the previous (or previous) sample of the nuclear red have been corrected in the subsequent sample, and to correct the unchanged or wrong corrections. There are two kinds of nuclear red: secondary nuclear red and anti-pressure nuclear red.