What's the exposure?

Exposure refers to the intensity and duration of light.

The brighter the object you want to shoot, the higher the shutter speed of the camera and the smaller the aperture. Aperture and speed should coordinate with each other. A single adjustment of one of them does not necessarily lead to accurate photos. On the contrary, if the object you want to shoot is very dark, you should slow down and enlarge the aperture.

In the era of negative film, exposure is to make the camera negative film or photosensitive paper sensitive under certain conditions, form a latent image after exposure, and then present the image after washing and processing; In the digital age, exposure is to expose the photosensitive element of the camera and transmit the image signal to the memory card, thus forming an image. To make the photosensitive assembly sensitive, the first condition is that it must be irradiated by "light", otherwise it will not be possible to complete the shooting.

Extended data:

Overexposure refers to the abnormal image caused by too large aperture, too high negative sensitivity or too long exposure time.

In the case of overexposure, the negative will appear too dark and the developed photos will turn white.

In the case of insufficient development and excessive aperture during development, the color of the photo will also turn white.

Sometimes it is also caused by the too strong light of the flash.

References:

Baidu Encyclopedia is overexposed.