Basler Camera User Manual page 218

Features
Setting Gamma Correction
You can use the Gamma parameter to set the gamma correction value.
Set the Gamma parameter value from within your application software by using the Basler pylon
API. The following code snippet illustrates using the API to set the parameter value to 1.2 as an
example:
// Set the Gamma value to 1.2
camera.Gamma.SetValue(1.2);
You can also use the Basler pylon Viewer application to easily set the parameters.
For more information about the pylon API and the pylon Viewer, see Section 3.1 on
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Basler ace USB 3.0