If you want to take pictures of snow scenes, what should you pay attention to in exposure compensation?

"It's snowing, how to take pictures" - A brief discussion on addition and subtraction of exposure compensation 1. First, let's talk about what exposure compensation is: Baidu Encyclopedia: Exposure compensation is also a method of exposure control, which is commonly seen in About ±2-3EV, if the ambient light source is too dark, you can increase the exposure value (such as adjusting to +1EV, +2EV) to highlight the clarity of the picture. The metering exposure system of a digital camera is the same as that of a traditional camera. When processing images, there is a very basic criterion, which is to restore all subjects to a neutral gray brightness of 18%. Therefore, when viewed from the camera's photosensitive system, Regardless of the original brightness of the object, it should ultimately be displayed in a medium-brightness tone. Therefore, during actual shooting, the photographer still needs to make corresponding judgments based on the complex conditions of the shooting scene. Only in this way can the ideal density and color restoration be ensured. 2. “The whiter the image, the more it increases” In other words, when the brightness of the subject is relatively high, exposure compensation needs to be increased. For example, when shooting landscape photos, if the light-toned content such as blue sky and white clouds occupies a large area, you should consider increasing the exposure appropriately. For forward light, increase it by at least half a stop, and for side light, add about one stop. If it is backlighting, you need to deal with the position of the sun, and at the same time, it depends on what content you want to express. Usually if you want to express the details in the picture accordingly, you need to increase the exposure by about 1.5-2 stops. The closer the sun is, the higher the exposure level. In the center of the picture, it is necessary to increase the exposure appropriately (of course, you should also pay attention to avoid the sun with strong light to prevent the camera image sensor from being damaged. For example, the sun without strong light, such as the red sun in the fog, the morning sunset, etc., Because their brightness is low, they will not affect the metering at all, so there is no need to consider exposure compensation issues). In addition, when shooting specific content such as snow scenes and foggy scenes, exposure compensation must be made as appropriate according to the characteristics of the object that needs to be displayed in a high-key form. Generally, when shooting snow scenes, it is best to compensate for the exposure by 1 stop to 1 and a half stops, otherwise the snow you will end up with is not white, but may become gray due to underexposure; when shooting foggy scenes, it is best to compensate for the exposure by half a stop to 1 stop, otherwise you will The resulting fog scene has a dark tone, close to that of a night scene, which is obviously not ideal. When photographing white flowers, people wearing white clothes, hospitals or laboratories with very bright environments, or airplanes with a large area of ??sky as the background, etc., you must make appropriate adjustments based on the relationship between the subject and the background. Positive exposure compensation.

3. "The darker it is, the less it is." In other words, when the brightness of the subject is relatively high, exposure compensation needs to be reduced. A typical example is night scene photography. In addition to buildings, streets or other bright content occupying the main area of ??the screen, there are two main methods to prevent overexposure. One is to use spot metering to meter the main objects. Exposure; Another method is to use exposure compensation to appropriately reduce the exposure according to the actual situation. Generally, when the shot takes up a large area of ??the sky (especially the metering-sensitive area in the middle of the frame), it is often necessary to reduce the exposure by 2 stops or more. In addition to shooting night scenes, when shooting other landscape subjects, such as dense tree shade in summer, mountains under backlight, etc., you must use negative exposure compensation to reduce the exposure. When photographing people wearing black clothing, photographing dark-toned textiles, etc., it is necessary to reduce the exposure to achieve normal tone restoration. Because digital cameras also determine exposure by measuring the reflected light of the subject, if the photographer does not make corresponding negative exposure compensation when dealing with objects with obviously low brightness, the final result will be a neutral gray tone. Obviously, it is difficult to accept the final conversion of an obviously black or dark-toned object into an image dominated by neutral gray. 4. "Be flexible in addition and subtraction" Sometimes the relationship between the subject and the background is complex, and at this time, you need to use it flexibly, not blindly rigidly. There are two main situations: first, the background brightness is high and the subject brightness is low, so exposure addition is required. This situation often occurs when photographing people in meetings. Sometimes the people are sitting in front of the window, and there is sunlight coming in from behind the window. The background appears brighter while the people are obviously darker. At this time, if a flash is not used as fill light, It is necessary to perform positive exposure compensation. Generally, after about 1 stop of positive exposure compensation, the character's facial texture will be significantly improved. Also, when shooting backlit portraits, if the background includes large areas of sky, water, and other high-brightness objects, positive compensation or other forms of auxiliary light must be used to improve the contrast, otherwise it will affect the reflection of the subject. Even if you use image processing software to brighten the characters later, the quality of the photo will be affected due to obvious noise. Second, the background brightness is low and the subject brightness is high, so exposure subtraction is required. This situation is often encountered in stage photography. Generally, when one or a small number of actors are performing on the stage, in order to attract the audience's attention, one or two follow-up lights are often used to shine on the characters. At this time, other backgrounds on the stage are It is not directly illuminated by light and appears almost black, so the contrast between the two is extremely high. Unless the performer is exactly in the center of the picture and you use spot metering mode, you must perform negative exposure compensation, otherwise overexposure will easily occur. Okay, let me finally say this: 1. Don’t rely entirely on post-production. Many friends shoot in RAW format. This is right and helps with sophisticated processing in post-production, but don’t rely entirely on post-production, especially in light processing.

Don't hand over things that can be done well in the first level to the second level. Everything will be the same. 2. After taking pictures using the exposure compensation method, don’t forget to adjust the compensation value back to “zero”, otherwise, the pictures you continue to take will either be overexposed or underexposed. In the same way, all the settings must be returned to their positions, haha, it’s over.