What does the photographer's tone mean?

This tone should refer to the high-key, low-key or middle tone of the photo. You can look at the gray histogram of the photo. If most of the peaks are concentrated on the left side of the histogram and there is no dead black, keep a low profile; If the peaks are mostly concentrated on the right side of the histogram and the overexposure degree is not obvious, it is high-profile; If the peak distribution is relatively uniform, it is a midrange.