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./othercms/croogo-4.0.7/vendor/intervention/image/src/Intervention/Image/Gd/Commands/ContrastCommand.php
<?php

namespace Intervention\Image\Gd\Commands;

use
Intervention\Image\Commands\AbstractCommand;

class
ContrastCommand extends AbstractCommand
{
   
/**
     * Changes contrast of image
     *
     * @param  \Intervention\Image\Image $image
     * @return boolean
     */
   
public function execute($image)
    {
       
$level = $this->argument(0)->between(-100, 100)->required()->value();

        return
imagefilter($image->getCore(), IMG_FILTER_CONTRAST, ($level * -1));
    }
}