I would like to ask, what is the difference between the so-called positive film and negative film?

After shooting a negative film, the image obtained after shooting, developing and fixing is black and white inverted, and red and green are exchanged (in a complementary color relationship), which is completely opposite to the color effect of the real thing, so it is called "negative film". The negative at this time is what we call "negative". You need to go through another printing program to get photos with the same color as the real thing. Most of the color films used by consumers are negative.

Positive film is also called negative film. The image obtained after shooting, developing and fixing is completely consistent with the real thing, so it is called "positive film". In the early years of teaching, the slides put on the slide projector were all positive films.

The negative film has a large tolerance, with an overexposure of about 3 grades or an underexposure of about 2 grades, and can get a passable effect when it is re-developed, so it has a strong ability to allow "mistakes" and the price is not high, which is suitable for the public. Of course, experts are not excluded, and there are also professional negatives for high-standard people to use.

The exposure deviation of positive film or negative film is generally not allowed to exceed 1 level, and the industry standard is that the error is within 1/2 level exposure. This one requires high equipment and technology, and the price is relatively high. It is generally used by professionals. Many photographers are also interested in feature films because of their accurate color reproduction.