public void SetBrightness(double _brightness)
{
if (_brightness <= BRIGHTNESS_MAX && _brightness >= BRIGHTNESS_MIN)
{
RAMP ramp = new RAMP();
ramp.Red = new ushort[256];
ramp.Green = new ushort[256];
ramp.Blue = new ushort[256];
for (int i = 1; i < 256; i++)
{
int iArrayValue = i * ((int)_brightness + 128);
if (iArrayValue > 65535)
{
iArrayValue = 65535;
}
ramp.Red[i] = ramp.Blue[i] = ramp.Green[i] = (ushort)iArrayValue;
}
SetDeviceGammaRamp(GetDC(IntPtr.Zero), ref ramp);
}
}
public static extern bool GetDeviceGammaRamp(IntPtr hDC, ref RAMP lpRamp);