GammaThe Gamma module helps to map pixel intensities into a more correct viewable image depending on the viewing device you are using. As most display devices like CRT tubes alter the image to < 1.0 gamma curve you might need to compensate for this display adjustment by increasing the gamma > 1.0.
Adjusting the gamma for image will increase the midtones in intensity while leave the lowest and highest pixel intensities as they are not unlike contrast adjustment.
1. Gain - specify the gamma gain to be applied to the image. Note that a gain < 1.0 will increase the overall intensity of the image whilst a gain > 1.0 increases the image's contrast.
For more information
Wikipedia - Gamma Correction
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