Which operating system?
> In my program, I call GetDeviceGammaRamp() to read the user's
> active gamma settings. Then, if there's not "sufficient" gamma
> adjustment, I set my own gamma ramp with SetDeviceGammaRamp().
> When the program exits, I restore the ramp I read back from
> GetDeviceGammaRamp() on start-up.
>
> Unfortunately, it appears that the device is lieing to me. I
> get the data as such:
>
> WORD userRamp[ 768 ];
> HDC dc = CreateDC( "DISPLAY", 0, 0, 0 );
> GetDeviceGammaRamp( dc, userRamp );
>
> What ends up happening is that I always get back some "default"
> gamma ramp with a little bit of compensation; I apply my own
> ramp, and then on shutdown I set the ramp "back" to some very
> low gamma setting.
>
> If I go into my display control panel settings and crank the
> gamma way up (both "game gamma" and "desktop gamma"), then
> starting my program will still retrieve the same "default" gamma
> ramp, apply its ramp (which is dimmer), and on shutdown, set the
> screen to a very dim setting.
>
> This is on a Radeon 9700, though I've heard similar problems
> from users with nVIDIA hardware as well.
>
> What's going on?
>
> / h+
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