Film material classification

The same type of film can be divided into four main characteristics: chromosensitivity, sensitivity (film speed), particle size, and contrast.

1, the performance of color and shade

Different types of film react differently to colors, especially color film. If the film is more sensitive to a certain color, shooting with it will give an exaggerated performance to the color, because the color of the rays will act on more photosensitive crystals.

Let's talk about the black and white film sense of color. The vast majority of black and white films sold on the market are full-color films, that is, the sensitivity to all visible light is approximately the same as the sensitivity of human eyes. For example, light red appears as a light gray tone on the photo, and dark red appears as a darker gray tone on the photo. As for other colors, such as blue, yellow, green, and so on. Although we cannot see the colors on the black and white panchromatic film images, we can see their relative luminosity and darkness.

There is a film called color-blind film for the printing industry that is sensitive to other colors except red. In this way, when you use it to shoot a scene, the red object on your negative film will appear relatively pale or even white, because the colorblind is characterized by red color blindness. Therefore, when light from a red object strikes the film, it is as if no light hits the film. As a result, the formation of a light or transparent image on the negative image becomes a darker image. The yellow or orange shot is roughly the same, because it is composed of red and yellow.

However, color blinds are only used for special purposes, such as printing plates, and only the supply of sheets. In fact, there is very little chance that a photo-trafficking partner will use a color-blind film, and he will never even use it, so he can ignore it.

In terms of the optical properties of color film, there will be more flexibility. Different brands and different series of color film will have different responses to different shades of light. Some will have more intense colors, and one pair will have more color for individual colors. There are many good performances. In addition, the color film also has some strong reactions to the colors. The photographs will be more gorgeous, but otherwise they will have more loyalty to the original colors.

As for color film performance of color film, it can be mainly divided into daylight type and light type, the former corresponds to normal daylight, or the environment of electronic flash lighting, such as tungsten light, will be seriously yellow; and "light type" film is Must be used for tungsten lighting, such as for daylight or flash, it will be heavily blue.

On the daylight slide, there are cool and warm tone. The color temperature of the latter is slightly lower, and portraits are more favourable.

Infrared film is a special film that is sensitive to infrared light. Colored infrared ray film, also black and white, it is particularly sensitive to the infrared spectrum, shooting the general human eye is invisible light, in addition to scientific and military uses, for artistic photography it can produce strange special effects.

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