public function fromRgb(array $rgb)
{
$mode = 'rgb';
foreach ($rgb as $channel => $value) {
if ($channel === 'a') {
$value = Util\Color::constrainValue((string) $value, 0, 1);
if ($value === 1) {
continue;
}
$mode .= 'a';
} else {
$value = Util\Color::normalizeRgbValue((string) $value);
}
$this->channels[$channel] = new Dimension($value);
}
$this->mode = $mode;
return $this;
}
