gamma ramp

Hi

I'm trying to set gamma ramp, but every time I switch task, and switch 
back, the settings are gone, even if I call every time 
SetDeviceGammaRamp with the same parameters. But if I change the gamma 
level a little bit (for example 1 byte) and call SetDeviceGammaRamp 
again, it work. Is there an other solution for realtime setting the 
gamma, or do I have to do it with the old way, rendering a blended quad 
over the full screen?

Thanks for your help.

Peter Balogh


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