Brightness/Contrast

The Brightness/Contrast command lets you make simple adjustments to the tonal range of an image. Unlike Curves and Levels, this command makes the same adjustment to every pixel in the image. The 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 the image. 

Brigthness value - setting of image brightness level. Positive values make the image brighter. Such values are relative figures. 

Contrast value - when the value is increased (higher contrast) dark sides of an image become darker and light ones are getting brighter. When the value is decreased the effect is just the opposite.

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