The GammaParams element defines the gamma value and optional offset for a Gamma element.
It is an Autodesk extension to the Academy/ASC XML color transform format.
Version 1.2.
No content.
The color channel to apply gamma correction to. Possible values are "R", "G", and "B". Optional.
If this attribute is not specified, the gamma correction is applied to all channels.
The power value to use. Valid values range from 0.1 to 10.0 inclusive. Required.
The offset to use. Valid values range from 10–6 to 0.9 inclusive. Optional.
If this attribute is used, the Gamma element's style attribute should be set to "moncurveFwd" or "moncurveRev". If it is not used, the style attribute should be "basicFwd" or "basicRev".