This page is an entry in the Key.
Brightness relationships
This is merely a term for the relative brightness of various areas of a photograph.
The depiction of those relationships must not misrepresent the appearance of the scene pictured, as per P7.
In TTG photographs, “not misrepresenting brightness relationships” is not simply a matter of depicting which areas are brighter or darker.
Instead, it’s a matter of how much darker or how much brighter some areas are in relation to others.
The two most common ways that brightness relationships fail to meet P7 are excessive burning and dodging and excessive application of HDR (and/or simulations of it).
Note also that darker/lighter tonal values may never be reversed in monochrome photographs or the photograph will be disqualified by P7; see #886.