RGB to HSV

RGBtoHSV.js

var rgbToHsv = function(r, g, b) {
    var rp = r / 255;
    var gp = g / 255;
    var bp = b / 255;

    var cmax = Math.max(rp, gp, bp);
    var cmin = Math.min(rp, gp, bp);

    var delta = cmax - cmin;

    var h = 0;
    if (delta === 0) {
        h = 0;
    } else if (cmax == rp) {
        h = 0.6 * (((gp - bp) / delta) % 6);
    } else if (cmax == gp) {
        h = 0.6 * (((bp - rp) / delta) + 2);
    } else if (cmax == bp) {
        h = 0.6 * (((rp - gp) / delta) + 4);
    }

    var s = cmax == 0 ? 0 : delta / cmax;
    var v = cmax;
    return [h, s, v];
};