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GetDeviceGammaRamp / SetDeviceGammaRamp alternative?

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Are there some alternatives to GetDeviceGammaRamp and SetDeviceGammaRamp for gamma adjustment/restoring? I''m having some problems with these: 1) GetDeviceGammaRamp ALWAYS returns the same ramp, regardless of what my driver control panel settings are, thus making it impossible to restore the original state when my game quits (I''ve tried this on both ATi and nVidia cards). 2) WindowsXP puts severe limits on SetDeviceGammaRamp, disallowing you from doing anything fun, like inverting the colors. I''m guessing there''s some way to directly access the video card drivers and change these settings, but I haven''t been able to find anything on it.

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