This page is an entry in the Key.
In other words, TCQ photographers need not fret about whether the contrast levels produced by their camera or device will meet Q7.
A photograph would be disqualified by Q7, for example, if a photographer applying rinairs judged that changes in contrast levels misrepresented the amount of fog, haze, smoke, fog, or blowing snow in the air at the time the exposure was made.
See also the entry on brightness relationships.
If unconventional contrast levels are part of your personal “style,” see this page.