public static bool SetBrightness(int gamma)
{
GammaRampRgbData data = new GammaRampRgbData
{
Red = new ushort[256],
Green = new ushort[256],
Blue = new ushort[256]
};
int wBrightness = gamma; // reduce the brightness
for (int ik = 0; ik < 256; ik++)
{
int iArrayValue = ik * (wBrightness + 128);
if (iArrayValue > 0xffff)
{
iArrayValue = 0xffff;
}
data.Red[ik] = (ushort)iArrayValue;
data.Green[ik] = (ushort)iArrayValue;
data.Blue[ik] = (ushort)iArrayValue;
}
return(SetGamma(ref data));
}
/// <summary>
/// Retrieves the current gamma ramp data so that it can be restored later.
/// </summary>
/// <param name="gamma"> [out] The current gamma. </param>
/// <returns> true if it succeeds, false if it fails. </returns>
public static bool GetCurrentGamma(out GammaRampRgbData gamma)
{
gamma = GammaRampRgbData.Create();
return(GetDeviceGammaRamp(GetDC(IntPtr.Zero), ref gamma));
}
private static extern bool GetDeviceGammaRamp(IntPtr hdc, ref GammaRampRgbData gammaRgbArray);
public static bool SetGamma(ref GammaRampRgbData gamma)
{
// Now set the value.
return(SetDeviceGammaRamp(GetDC(IntPtr.Zero), ref gamma));
}