How is the "all black" background that often appears in portrait photography taken?

In fact, it is not difficult to get a black background, indoor and outdoor, natural light, artificial lighting and so on.

Just pay attention to a few points:

1. Spot check, which is the most critical;

2. There is a certain contrast between the background and the subject. The subject is bright and the background is dark, so it is not necessary to be completely black relative to the subject. A certain contrast between light and shade is also the most critical;

3. At night and when the light is dim, use a flash to illuminate the foreground. Note that the background at this time must be far away, far away from Jiao Wai, where it will not be illuminated by flash lights;

4. If you feel that the background is not pure enough, you can draw a curve at the back to make the background darker. The premise is that the subject is bright enough, and the subject is dark without any details.

5. Backlight, in fact, this is similar to 2. At this time, the main part of the backlight is bright;

Here are some pictures of black background that I took at different times indoors and outdoors to illustrate what I mentioned above. Be careful not to deliberately pursue shooting in a dark environment, because this is not a necessary condition for taking pictures with black background.