What is a feature film?

Positive film is a general term for photosensitive film used to print photos, slides and film copies. It can print the negative film on the negative film into a positive film, so that the brightness or color of the image is the same as that of the subject. The sensitivity of black-and-white positive film is limited to purple-blue light, and the sensitivity of color positive film is weaker than that of color negative film, so positive film is rarely used in photography. After the negative film taken by the film camera is developed and edited, several copy tapes (the original film is very precious) are copied first, and then corrected with the positive film, and then it can be shown in the cinema. Positive film is also called negative film.