HSL to RGB 変換 JS オブジェクト #max7

JSオブジェクト用コード

function rgbToHsl(r, g, b){

	r /= 255, g /= 255, b /= 255;

	var max = Math.max(r, g, b), min = Math.min(r, g, b);

	var h, s, l = (max + min) / 2;

if(max == min){
h = s = 0; // achromatic
}else{
var 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;
}
outlet(0, h, s, l);
}

function hslToRgb(h, s, l){
var r, g, b;

if(s == 0){
r = g = b = l; // achromatic
}else{
function hue2rgb(p, q, t){
if(t < 0) t += 1; if(t > 1) t -= 1;
if(t < 1/6) return p + (q - p) * 6 * t;
if(t < 1/2) return q;
if(t < 2/3) return p + (q - p) * (2/3 - t) * 6;
return p;
}

var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
var p = 2 * l - q;
r = hue2rgb(p, q, h + 1/3);
g = hue2rgb(p, q, h);
b = hue2rgb(p, q, h - 1/3);
}
r = Math.round(r*255);
g = Math.round(g*255);
b = Math.round(b*255);
outlet(0,r, g, b);
}

引用元

RGB to HSL conversion

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