public function getHexValue()
{
$channels = $this->channels;
if (isset($channels['a']) && $channels['a']->getValue() !== 1) {
return null;
}
if ($this->mode === 'rgb') {
return Util\Color::rgbToHex($channels['r']->getValue(), $channels['g']->getValue(), $channels['b']->getValue());
} else {
if ($this->mode === 'hsl') {
return Util\Color::hslToX11($channels['h']->getValue(), $channels['s']->getValue(), $channels['l']->getValue());
}
}
}
