The role of exposure in photography

Exposure is the most basic and important technology in photography. Whether the exposure is appropriate or not directly affects the texture, clarity and color of the image and the room for digital post-processing. ... photography. It records the different brightness of the scene on the film (photosensitive electronic device) through the camera. This process is accomplished by controlling the aperture and shutter.

The significance of exposure

The camera in our hands is facing nature, which is a colorful and multi-level world with endless light changes. The purpose of photography is to record all kinds of things in real life with photosensitive film. It all depends on the correct exposure of photographic film. There is no doubt that it is impossible for a negative with incorrect exposure to obtain a good artistic effect.

Beginners, the first problems they come into contact with are probably related to photographic exposure, that is, they want to get an ideal photographic work through correct exposure. In order to solve this problem, it is necessary to study and master the theory and concept of exposure control.

Definition of exposure

Exposure is to let the light pass through the lens to form image light, enter the black box and reach the photographic film, so that the photographic emulsion of the film produces latent image under the photochemical action.

In the emulsion layer of photosensitive film, tiny silver halide crystals with photosensitive function undergo potential photochemical changes under the irradiation of light, forming images that cannot be observed by human naked eyes, so it is called latent image. After the exposed film is developed and fixed, the latent image becomes a visible image, and then the image is a negative image. After the negative film is developed and enlarged in a darkroom, it becomes a positive film with the same brightness as the original scene, which is the final product of photography-an ideal photo. In the whole process of photography, the primary factor affecting the formation of negative image density on negative film is the determination of exposure combination, followed by film processing technology. These two factors are the key to determine whether the film density is correct or not.