View file vendor/intervention/image/src/Intervention/Image/Gd/Commands/BrightnessCommand.php
<?php namespace Intervention\Image\Gd\Commands; class BrightnessCommand extends \Intervention\Image\Commands\AbstractCommand { /** * Changes image brightness * * @param \Intervention\Image\Image $image * @return boolean */ public function execute($image) { $level = $this->argument(0)->between(-100, 100)->required()->value(); return imagefilter($image->getCore(), IMG_FILTER_BRIGHTNESS, ($level * 2.55)); } }