lets you make simple adjustments to the tonal range of a photo. Unlike Curves and
Levels, this command makes the same adjustment to every pixel in the photo.
Brightness/Contrast command does not work with individual channels and is not
recommended for high-end output, because it can result in a loss of detail in
Brigthness value - setting of photo brightness level.
Positive values make the photo brighter. Such values are relative
Contrast value - when the value is increased
(higher contrast) dark areas of a photo become darker and light ones are
getting brighter. When the value is decreased the effect is just the opposite.
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