Single lens reflective black background

SLR cameras should take pictures of people and things with black backgrounds. In order to prevent black background, we need to pay attention to the following points:

It is best to keep the distance between the black background and the person or object being photographed as much as possible to avoid the light hitting the object and shining on the black background, which will affect the color purity of black;

If the subject is transparent glass, it is usually photographed by illuminating both sides of the transparent glass. At this time, if it is a black background, the average or central key is directly used to measure light. In order not to make the black beat gray, it is necessary to reduce the exposure compensation by 1~2. If 18% gray board is temporarily placed behind the cup for average or central key metering, there is no need for exposure compensation;

If the person or object being photographed is large and opaque, the average or central focus photometry can be used to expose according to the measured exposure parameters;

If the subject occupies a small proportion in the picture, or it is large but not in the picture, it is necessary to shoot the subject after spot metering, or temporarily put a 18% gray board behind the subject for average or central key metering, and then shoot again according to the metering data after re-composition.