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Color Temperature to RGB
// From http://www.tannerhelland.com/4435/convert-temperature-rgb-algorithm-code/
// Start with a temperature, in Kelvin, somewhere between 1000 and 40000. (Other values may work,
// but I can't make any promises about the quality of the algorithm's estimates above 40000 K.)
function colorTemperatureToRGB(kelvin){
var temp = kelvin / 100;
var red, green, blue;
if( temp <= 66 ){
red = 255;
green = temp;
green = 99.4708025861 * Math.log(green) - 161.1195681661;
if( temp <= 19){
blue = 0;
} else {
blue = temp-10;
blue = 138.5177312231 * Math.log(blue) - 305.0447927307;
}
} else {
red = temp - 60;
red = 329.698727446 * Math.pow(red, -0.1332047592);
green = temp - 60;
green = 288.1221695283 * Math.pow(green, -0.0755148492 );
blue = 255;
}
return {
r : clamp(red, 0, 255),
g : clamp(green, 0, 255),
b : clamp(blue, 0, 255)
}
}
function clamp( x, min, max ) {
if(x<min){ return min; }
if(x>max){ return max; }
return x;
}
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