What does highlight exposure mean?

In digital photography, accurate exposure in the usual sense (technically) refers to the exposure of middle tones, and there is no overexposure in high-light areas. The reason why it is emphasized that there is no overexposure in high-light areas is that overexposure in high-light areas damages details more seriously than underexposure in dark areas.

Therefore, if the illumination ratio of a scene is beyond the dynamic range of the photo, you need to choose whether to keep the highlights or the dark parts. And unless the highlight area is small and there is nothing worthy of attention, you should try to keep the highlight area. Overexposure of highlights usually makes people feel that there is something missing in the photo, while underexposure of shadows is more acceptable and sometimes has a unique effect.

In order to accurately expose the halftone, it is necessary to sample the object with halftone color. Adjust the camera parameters until the exposure indicator of the spot metering result is at "0", and then confirm that the highlights are not overexposed, so you can shoot.