One of several adjustments you can make to your photo using the ZoneMapper tool is brightness.
"Brightness" is what is perceived as the tonal range starting from the highest highlights down to the midtones. Your photo can be adjusted to appear brighter without increasing exposure by lifting up the midtones.
(a) before | (b) after | |
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Note: To decrease the brightness of you photo, drag the zone lock downwards rather than upwards.