function RGBtoHSV(r, g, b){
	var h, s, v;
	var max = Math.max(r, g, b);
	var min = Math.min(r, g, b);
	if(max - min > 0) {
		if(g == max) {
			h = (b - r) / (max - min) * 60 + 120;
		}
		else if(b == max) {
			h = (r - g) / (max - min) * 60 + 120;
		}
		else {
			h = (g - b) / (max - min) * 60;
		}
		if (h < 0) h += 360;
		h = parseInt(h);

		s = parseInt((max - min) / max * 0xff);
	}
	else {
		h = 0;
		s = 0;
	}
	v = max;
	return Array(h, s, v);
}

function HSVtoRGB(h, s, v){
	var r, g, b;
	var num1 = parseInt(v * (0xff - s) / 0xff); // 最小値
	var num2 = parseInt(v * (1 - s / 0xff * (h % 60) / 60)); // 2番目の色(正の方向の場合)
	var num3 = parseInt(v * (1 - s / 0xff * (1 - (h % 60) / 60))); // 2番目の色(負の方向の場合)
	switch(parseInt(h / 60)) {
	case 0:
		r = v;
		g = num3;
		b = num1;
		break;
	case 1:
		r = num2;
		g = v;
		b = num1;
		break;
	case 2:
		r = num1;
		g = v;
		b = num3;
		break;
	case 3:
		r = num1;
		g = num2;
		b = v;
		break;
	case 4:
		r = num3;
		g = num1;
		b = v;
		break;
	default:
		r = v;
		g = num1;
		b = num2;
		break;
	}
	return Array(r, g, b);
}