What is the difference between positive and negative films when taking pictures?

Positive film, also known as reversal film. Is the general name for the photosensitive film used to print photos, slides and film copies. It can print the negative image on the film into a positive image, so that the brightness or color of the image is the same as that of the subject. The color sensitivity of black and white positive films is limited to purple-blue light, and the color sensitivity of color positive films is weaker than that of color reverse films. Therefore, positive films are rarely used in photography.

A negative film is an image obtained after exposure and development. Its light and shade are opposite to the subject, and its color is the complementary color of the subject. It needs to be printed on the photo before it can be restored to the positive image. . The film used to develop photos is a negative. In black and white films, people's hair appears white on the negative film, but in fact white clothes appear black on the film.

Extended information:

Color positive film

Color positive film is used to print color projection copies (movies, slide shows). Not used for shooting, low sensitivity, all light type. The characteristics are: high contrast, low haze, high definition, and low sensitivity (and the slides and actual effects are mirrored left and right).

Color positive film is a color film used for photography. It forms a color transparent positive image after exposure and processing. One of the main uses of color reversal film is to make slides, and the second use is for printing and plate making. Its image clarity, color saturation, layering, granularity, etc. are better than those of color photos.

Baidu Encyclopedia-Positive Film

Baidu Encyclopedia-Negative Film