Gamma
The Gamma effect measures the brightness of midtone values and modifies the pixel values in an image. A higher gamma value yields an overall lighter image.
In the Properties Area of the Video Effect window you can change the effect propertieschange the effect properties.
The only property available for setting is Gamma Level.
In the figures below you can see the video picture before and after applying the Gamma effect:
Before applying the Gamma effect
After applying the Gamma effect