public function getOption($value)
	{
		if(is_array($value))
		{
			return $this->_getOptionFromArray($value);
		}
		elseif(preg_match($this->shortHandRegex, strtoupper($value)))
		{
			return '-channel ' . $value . ' ';
		}
		else
		{
			$msg = 'Invalid argument $value "' . $value . '", allowed values are ' . implode(', ',
			                                                                                 $this->allowedOptions)
			       . ' as array (e.g.: ["Green", "Blue"]) or some of the characters R G B A O C M Y K without whitespaces and unique';

			return $this->_optionValueException($msg);
		}
	}