ContrastCommand.php

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<?php
 
namespace Intervention\Image\Gd\Commands;
 
class ContrastCommand extends \Intervention\Image\Commands\AbstractCommand
{
    public function execute($image)
    {
        $level = $this->argument(0)->between(-100, 100)->required()->value();
 
        return imagefilter($image->getCore(), IMG_FILTER_CONTRAST, ($level * -1));
    }
}