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Have a look at this pic from wikipedia:...sorry, you cannot view external links. To see them, please
REGISTER or LOGINThis shows how the curve is changed by altering the gamma. When you alter the brightness you raise the entire curve up along the y-axis whilst maintaining the same slope, and when you increase the contrast you tilt the curve anti-clockwise and make it steeper.Note that changing the brightness or contrast means that the ends of the curve are flattened and you lose information at the extremes.