Photography exposure compensation knowledge

Photography exposure compensation knowledge

Exposure refers to the amount of light entering the lens and shining on the photosensitive element in the process of photography, which is controlled by aperture, shutter and sensitivity. Let me share with you the knowledge of photographic exposure compensation. Welcome to read and browse.

Exposure compensation

The results of automatic exposure are often inaccurate, so you need a method to adjust the exposure. Exposure compensation is such an exposure control method, which is generally common in? 2-3EV, if the ambient light source is dark, you can increase the exposure value to highlight the brightness of the picture. Exposure compensation is automatically calculated by consciously changing cameras? Is it suitable? Exposure parameters, a shooting technique that makes photos brighter or darker. Photographers can adjust the brightness of photos according to their own ideas to create unique visual effects.

Automatic exposure error condition

Generally speaking, the smaller the contrast of scene brightness, the more accurate the exposure will be, otherwise the greater the deviation will be. Of course, the grade of the camera is also very important. There are high and low grades of cameras. Advanced cameras are more accurate in metering, while low cameras will increase the deviation. But this does not mean that the automatic exposure of advanced cameras must be very accurate.

In most cases, shooting according to the data provided by the camera's automatic metering can make most photos get basically accurate exposure. This is because the exposure meter reads 18% gray tone, and 18% gray is the average light value in our daily life scenes, such as our skin color. However, the correct exposure is not equal to the best exposure, especially when white or bright objects are dominant in the picture, there will be obvious deviation when shooting only according to the photometric data of the camera, that is to say, the white objects, bright objects and dark objects in the picture are all 18% gray scale, which is naturally not ideal. At this time, exposure compensation can play an extremely important role.

When do I need to use exposure compensation

For most people, the way to judge whether the exposure is correct is to play back through the LCD screen and check the photo effect directly after shooting. This method is intuitive, but not necessarily accurate.

More accurate. The method is to observe the histogram. When the camera plays back the photos, you can choose whether to display the histogram. If the black spots on the histogram are evenly distributed and there are no faults, then the exposure of this photo is more accurate. If it is crowded aside or there are obvious faults, then pay attention to the exposure of the photos. At this time, it is necessary to use exposure compensation to shoot again. Of course, this is not absolute. For example, if you take a silhouette, there will be a fault.

? White plus black minus?

There are many ways to adjust the exposure compensation. Here are some common ones. For most SLR cameras, press and hold the camera mark? +/-? Button, and then toggle the wheel, you can adjust the exposure compensation. You can view the adjusted value on the optical viewfinder or LCD screen.

? 0? Represents zero compensation,+represents increasing exposure compensation, and-represents decreasing exposure compensation. Going? +? Adjust the direction, the picture will be bright; Going? -? Adjust the direction, and the picture will be darkened. Generally, the adjustment range of camera exposure compensation is -3EV to +3EV, and the minimum adjustment gear is 1/3. Of course, if you are not familiar with these shortcut keys, you can also enter the menu to set exposure compensation.

When shooting portraits of girls, it is suggested to increase the exposure compensation of 1/3; When taking silhouette, it is suggested to reduce the exposure compensation by 2 steps. You can try more and watch the shooting effect through playback.

Remember a principle: white plus black minus. When your subject is white, you need to add a little exposure compensation; When your subject is black, you need to reduce exposure compensation.

Adjustment of exposure compensation

Most general digital SLR cameras have adjustable exposure compensation of positive and negative three gears, which can meet the shooting and creative needs in most complex situations. As for some advanced flagship SLR cameras, exposure compensation even reaches plus or minus 5 files, which can meet the shooting needs in extremely complex lighting environment. Therefore, advanced camera adjustability is better than some entry-level machines. The principle of value for money has not changed.

Camera automatic metering always has limitations, and different metering methods have great influence on the final exposure. Even if the exposure is accurate, your creative intention is not necessarily? Is it accurate? For example, sometimes, you deliberately want to take a silhouette, but the automatic exposure of the camera gives you a very? Is that correct? Exposure rate. At this time, exposure compensation becomes your only choice.

If there is no exposure compensation, then obviously you can only control the exposure of the picture through M blocks, which is undoubtedly very troublesome. Exposure compensation is not only convenient for your shooting, but also can be adjusted according to your own creative intention.

This statement is not entirely correct. RAW format is a digital negative, which is more adjustable than JPEG. Of course, its exposure latitude is also higher than JPEG format. But it is also very limited. We don't recommend correcting the exposure problem through post-adjustment, because it is very difficult. Basically, the exposure deviation of the first and half files can be easily corrected by the post-adjustment of the RAW format. But the deviation is too big, and the RAW format is powerless.

Make the exposure more accurate. The RAW format is only used as the material for fine-tuning in the later stage, or as an emergency measure after your early shooting mistakes. If it is the error of color temperature, then you can shoot in RAW format, and you can safely hand it over to the later stage.

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