rgb2hsl · JavaScript Function to Convert Colors from RGB to HSL

function rgb2hsl (r, g, b) {
    var max, min, h, s, l, d
    r /= 255
    g /= 255
    b /= 255
    max = Math.max(r, g, b)
    min = Math.min(r, g, b)
    l = (max + min) / 2
    if (max == min) {
        h = s = 0
    } else {
        d = max - min
        s = l > 0.5 ? d / (2 - max - min) : d / (max + min)
        switch (max) {
            case r:
                h = (g - b) / d + (g < b ? 6 : 0)
                break
            case g:
                h = (b - r) / d + 2
                break
            case b:
                h = (r - g) / d + 4
                break
        }
        h /= 6
    }
    h = Math.floor(h * 360)
    s = Math.floor(s * 100)
    l = Math.floor(l * 100)
    return { h: h, s: s, l: l }
}