Kneel down! ! According to the black clothes, it is gray.

This has nothing to do with white balance and noise. Some people don't know anything, but just quote some nouns they have heard. It is a simple exposure problem, white plus black MINUS, which has existed in the movie era.

The automatic metering system of the camera is based on 18% ash. No matter whether the scene is black or white, the camera's metering system makes the scene appear 18% gray on the negative through exposure. In most cases, this will get accurate exposure. But shooting a large area of light and dark scenery is not enough.

When shooting a large area of light color, it is necessary to increase the exposure of 1-2 through exposure compensation.

When shooting a large area of dark color, it is necessary to reduce the exposure of 1-2 files through exposure compensation.

Black, purple, blue and brown are all dark objects. You should reduce the exposure by exposure compensation 1-2.