gistfile1.js

function xyz_from_wavelength (ColorTemp, lw, currentCIE) {

    var nmMin = 380;
    var nmMax = 780;
    var degrees = 5;

    var XYZ = {x: 0,
               y: 0,
               z: 0};

    //currentCIE pode ser "1931" ou "1965" 
    var nmMinIndex = nmMin - beta[currentCIE][0][0];
    var nmMaxIndex = beta[currentCIE].length - 1 -
                     (beta[currentCIE][beta[currentCIE].length - 1][0] - nmMax);

    var XSum = 0,
        YSum = 0,
        ZSum = 0;

    var wSum = 0,
        mac = 0;

    for (nm = nmMinIndex; nm <= nmMaxIndex; nm += degrees) {

        // calculate X
        XSum += beta[currentCIE][nm][1] * lw[illuminant][nm][1] * ColorTemp[mac];

        // calculate Y
        YSum += beta[currentCIE][nm][2] * lw[illuminant][nm][1] * ColorTemp[mac];

        // calculate Z
        ZSum += beta[currentCIE][nm][3] * lw[illuminant][nm][1] * ColorTemp[mac];

        wSum += beta[currentCIE][nm][2] * lw[illuminant][nm][1];
        mac++;

    }

    return cXYZ(XSum/wSum, YSum/wSum, ZSum/wSum);
}