What is the function of closing and opening h d r on the camera of Xiaomi mobile phone?

I also use Xiaomi, but I didn't notice this function of the camera before. Let's talk about HDR.

HDR is a commonly used technology in photography, and it is a British high dynamic.

The abbreviation of Range means "high dynamic range". HDR technology can overcome the shortcomings of limited dynamic range of most camera sensors, and control the tone of the picture within the range that can be recognized by human beings. It can superimpose multiple photos with different exposures into a delicate image.

HDR means to make your photos clear in highlights and shadows. Let's be clear, that is, you shoot works with large light ratio and reduce the light ratio to create underexposed highlights and underexposed dark tones. Let the effect of light be bright, while the darkness keeps more details, so that the outline and depth of an object can be distinguished, instead of a mass of black in the past. That is to say, for example, if we take a picture of the bright sky, under normal circumstances, the result of the shooting is either that the sky is over-exploded or that the ground scenery is under-exposed.