SetDeviceGammaRamp

[郭强]

Hi,
I got a question about how to use SetDeviceGammaRamp Function.
 
As in SDK, Remarks said:'SetDeviceGammaRamp succeeds only for devices with drivers that support downloadable gamma ramps in hardware.'
And I tried in my pc, the function return FALSE. but in my friend's pc, it work well.
Maybe my pc doesnot support downloadable gamma ramps.
 
So How do I know if my device support that?
What's the definition of downloadable gamma ramps ?
And what kind of device support that?
 
Thanks so much!



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