How can I program a NVIDIA brightness slider like the Volume slider?

I like how you can quickly adjust the volume by clicking the icon and then scrolling the mouse wheel,

how can I write something similar for the NVIDIA brightness (not the backlight of m开发者_开发技巧y laptop screen)?

I'm tired of different video black levels which take down their quality,

this would allow me to quickly adjust it and a mute button would serve as a way to reset it.

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You could probably do this using NVAPI, the same interface the NVIDIA Control Panel uses. I haven't tested to be sure, but the NvAPI_VIO_SetGamma function sounds like a good starting point.

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NvAPI_GetVideoState & NvAPI_SetVideoState ;)