/**
* Adjusts brightness of the $hex color.
*
* @param string $hex The hex value of a color
* @param integer $steps should be between -255 and 255. Negative = darker, positive = lighter
* @return string returns hex color
*/
public static function adjust_brightness($hex, $steps)
{
$color_obj = new self($hex);
$steps_percent = round($steps * 100 / 255, 2);
$new_color = $color_obj->color->incrementLightness($steps_percent);
$new_color_obj = new Jetpack_Color($new_color);
return self::sanitize_hex($new_color_obj->toCSS('hex'));
}
