Surround exposure (what is exposure compensation and surround exposure?)
Exposure compensation
Exposure compensation is also called EV (exposure value) adjustment. It refers to a technical means to achieve a better effect by adjusting the exposure value during the photography process. Although some cameras can automatically calculate the exposure value, it is not necessarily absolutely correct, and it is not necessarily what the photographer wants. At this point, the photographer can adjust exposure compensation as needed. Increasing exposure compensation by 1EV is equivalent to reducing the exposure value (EV) by 1, that is, doubling the amount of incident light, which can make the image brighter; otherwise, the image will be darker.
The adjustment of exposure compensation is determined by experience and sensitivity to color. Users must compare the image quality, sharpness, reproduction and noise under different exposure compensations in order to take better photos.
When should I use exposure compensation on Youyou.com?
If you use a camera with an exposure meter or automatic exposure function, you should consider exposure compensation in the following situations:
1. Backlight photography. If your subject is facing away from the bright sun, that is, in the case of backlighting, then in order to accurately show the details of the subject, exposure compensation must be performed. Otherwise, the shot will be either a silhouette or a gray image with unclear layers.
2. The reflectivity of the subject itself is too high or too low. For example, if you are shooting on the mining face of a coal mine, or shooting a bride in a white wedding dress against a high-key background, if the exposure given by the exposure meter is not compensated, then the dark coal and the white wedding dress recorded on the film may be the same 18% Gray tone.
3. Reciprocity rate failure. If the exposure time is too long (greater than 1/10 second) or too short (less than 1/1000 second), the exposure curve of ordinary film will be distorted. If you still shoot according to the exposure combination given by the exposure meter, there will be underexposure. If you use a color filter, there will be deviations in color saturation and color temperature.
4. Shoot moving objects in particularly weak light. Sometimes the light of the shooting scene is extremely weak, the artificial light is insufficient, the subject is moving, and the film sensitivity in the camera cannot meet the requirements of the scene light. At this time, compensation is also required, that is, to reduce the given exposure within the allowable range, and to control the forced development (or “sensitized development”) to reduce the exposure during the developing process, and a clear negative film can also be obtained.
Brackets
Although digital reflective metering technology is becoming more and more perfect, metering errors may still occur due to the ever-changing light conditions and subjects. In order to prevent important shooting pictures from being missed due to metering errors, digital SLR cameras all have the function of surround exposure.
Exposure (also called bracket) can better solve this problem. The method is to first expose a photo according to the luminosity value, and then increase or decrease the exposure of Youyou.com on this basis. If you are still not sure, you can change the exposure and take a few more shots. can be based on 1/3EV, 0.5EV, 1EV and other steps to adjust the exposure. The exposure of each photo is different, so that a satisfactory one can be selected from a series of photos.
When you are not sure whether the exposure is correct, you can use the automatic exposure bracketing function to ensure the accuracy of the exposure and improve the quality of the photo. The auto-exposure features of digital cameras even allow users to combine underexposed and overexposed photos into a single correctly exposed photo—even if none of the photos were properly exposed when you took them.