To specify gamma correction for the SDI output
From the NVIDIA Control Panel Select a Task pane, under Workstation, click Manage SDI output settings.
Click the Colour Settings tab, and then specify the RGB Gamma values using one or more of the following methods:
Click and drag each R, G, or B slider to the appropriate value.
Enter the R, G, or B value in the respective boxes or use the up and down arrows.
To keep all gamma channels at the same value while you adjust them simultaneously, click the Lock all channels check box.
Click OK when finished.