Brightness/Contrast
Brightness/Contrast command let the user make simple adjustments
to the tonal range of an image. Unlike Curves and Levels, which apply proportional adjustments
to the pixels in an image (nonlinear adjustment) based on user's settings of black or
white points or the gamma, this command makes the same adjustment to every pixel in
the image (linear adjustment). The Brightness/Contrast command is not recommended for high-end
output because it can result in loss of image details.
To use the Brightness/Contrast command:
Choose Image > Adjustments > Brightness/Contrast.
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