/// <summary>
/// Turns a temperature (between 0K and 70000K) into a color profile.
/// </summary>
public static ColorAdjustment GetColorProfile(double temperature)
{
var result = new ColorAdjustment();
// Code from http://www.tannerhelland.com/4435/convert-temperature-rgb-algorithm-code/
temperature = temperature / 100;
if (temperature <= 66)
{
result.Red = 255;
}
else
{
result.Red = temperature - 60;
result.Red = 329.698727446 * (Math.Pow(result.Red, -0.1332047592));
if (result.Red < 0) result.Red = 0;
if (result.Red > 255) result.Red = 255;
}
if (temperature <= 66)
{
result.Green = temperature;
result.Green = 99.4708025861 * Math.Log(result.Green) - 161.1195681661;
if (result.Green < 0) result.Green = 0;
if (result.Green > 255) result.Green = 255;
}
else
{
result.Green = temperature - 60;
result.Green = 288.1221695283 * (Math.Pow(result.Green, -0.0755148492));
if (result.Green < 0) result.Green = 0;
if (result.Green > 255) result.Green = 255;
}
if (temperature >= 66)
{
result.Blue = 255;
}
else
{
result.Blue = temperature - 10;
result.Blue = 138.5177312231 * Math.Log(result.Blue) - 305.0447927307;
if (result.Blue < 0) result.Blue = 0;
if (result.Blue > 255) result.Blue = 255;
}
result.Red /= 255;
result.Green /= 255;
result.Blue /= 255;
return result;
}
public void SetColorProfile(ColorAdjustment adjustment, int gamma)
{
Log.Info($"SetColorProfile {adjustment}, gamma {gamma}");
if (gamma <= 256 && gamma >= 1)
{
var ramp = new GammaRamp {
Red = new ushort[256], Green = new ushort[256], Blue = new ushort[256]
};
for (int i = 1; i < 256; i++)
{
ushort r, g, b;
if (_linearGammaRamp.Red == null)
{
r = (ushort)(i * (gamma + 128));
}
else
{
r = _linearGammaRamp.Red[i];
}
if (_linearGammaRamp.Blue == null)
{
b = (ushort)(i * (gamma + 128));
}
else
{
b = _linearGammaRamp.Blue[i];
}
if (_linearGammaRamp.Green == null)
{
g = (ushort)(i * (gamma + 128));
}
else
{
g = _linearGammaRamp.Green[i];
}
ramp.Red[i] = (ushort)(r * adjustment.Red);
ramp.Green[i] = (ushort)(g * adjustment.Green);
ramp.Blue[i] = (ushort)(b * adjustment.Blue);
}
var success = SetDeviceGammaRamp(_hdcMonitor, ref ramp);
Log.Debug($"SetDeviceGammaRamp {_hdcMonitor} with result {success}");
}
}
public void SetColorProfile(ColorAdjustment adjustment, int gamma)
{
_monitor.SetColorProfile(adjustment, gamma);
}
public void SetColorProfile(ColorAdjustment adjustment)
{
_monitor.SetColorProfile(adjustment);
}
public void SetColorProfile(ColorAdjustment adjustment)
{
SetColorProfile(adjustment, DefaultGamma);
}
public void SetColorProfile(ColorAdjustment adjustment, int gamma = DefaultGamma)
{
if (_baseRamp.Blue == null || _baseRamp.Red == null || _baseRamp.Green == null)
{
Log.Warn("The monitors current gamma ramp is unavailable. Falling back to default gamma ramp.");
}
if (gamma <= 256 && gamma >= 1)
{
var ramp = new RAMP { Red = new ushort[256], Green = new ushort[256], Blue = new ushort[256] };
for (int i = 1; i < 256; i++)
{
ushort r, g, b;
if (_baseRamp.Red == null)
{
r = (ushort)(i * (gamma + 128));
}
else
{
r = _baseRamp.Red[i];
}
if (_baseRamp.Blue == null)
{
b = (ushort)(i * (gamma + 128));
}
else
{
b = _baseRamp.Blue[i];
}
if (_baseRamp.Green == null)
{
g = (ushort)(i * (gamma + 128));
}
else
{
g = _baseRamp.Green[i];
}
ramp.Red[i] = (ushort)(r * adjustment.Red);
ramp.Green[i] = (ushort)(g * adjustment.Green);
ramp.Blue[i] = (ushort)(b * adjustment.Blue);
}
SetDeviceGammaRamp(GetDC(IntPtr.Zero), ref ramp);
}
}
