public static function xyz2rgb( $xyz )
	{
		list( $x, $y, $z ) = $xyz;
		$r	= 3.063219 * $x - 1.393326 * $y - 0.475801 * $z;
		$g	= -0.969245 * $x + 1.875968 * $y + 0.041555 * $z;
		$b	= 0.067872 * $x - 0.228833 * $y + 1.069251 * $z;
		$r	= round( $r * 255 );
		$g	= round( $g * 255 );
		$b	= round( $b * 255 );
		return array( $r, $g, $b );
	}