Traditional Culture Encyclopedia - Photography major - Positive film, what is negative film? What role do they play in photography?

Positive film, what is negative film? What role do they play in photography?

Negative is the material used for exposure in photography.

Negative film includes positive film and negative film

Color film can be divided into two types, namely reverse film and negative film. Color reversal film, sometimes called slide (positive film), is a kind of film that can directly get transparent positive color after reversal development. The color reversal film can be viewed by projecting the image directly onto the screen through the slide projector or on the observation light box. It can not only print and play photos directly, but also be used as the original film for color separation and plate making. The color reversal film is truly saturated, and the clarity and sharpness of the image are relatively high. However, compared with color negative film, the exposure latitude is relatively narrow, a little insufficient or excessive will affect the imaging quality. Therefore, the exposure must be very accurate when making a reverse film. Color negatives are mainly used to print and play color photos. After shooting and developing, color negative with orange cover can be obtained, whose light and shade are opposite to the subject, and their colors are complementary. The advantage of color negative film is that exposure latitude is big. Generally, the exposure is less than one level or more than two levels, and satisfactory images can still be obtained. In addition, color negatives are quite universal to the change of color temperature, and the color balance and contrast can be adjusted again through the color filter of magnifying glass when printing and playing photos. The English brand suffix of COLOR negative film is color, and the suffix of reverse film is krom. On the film box marked in English, negative film and negative film can be distinguished according to the above two suffixes. In addition, according to the color temperature balance, color films can also be divided into two categories: daylight type and illumination type. Sunlight color film is suitable for shooting under the illumination of sunlight or electronic flash with a color temperature of about 5500K, and light color film is suitable for shooting under light sources such as iodine tungsten lamp with a color temperature of about 3200K K.. If you shoot with daylight film under the light with a color temperature of about 3200 K, the picture will appear orange-red, and a blue color temperature conversion filter should be added in front of the camera. On the contrary, if you shoot with a light film in the sun with a color temperature of about 5500K, the picture will be blue, and an amber color temperature conversion filter should be added in front of the lens to get accurate color reproduction.

Negative is used to take pictures. Requires high sensitivity and tolerance.

Feature films are for showing. It requires fine particles, large contrast, small fog, high resolution and high definition.