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

namespace Intervention\Image\Gd\Commands;

use
Intervention\Image\Commands\AbstractCommand;

class
GreyscaleCommand extends AbstractCommand
{
   
/**
     * Turns an image into a greyscale version
     *
     * @param  \Intervention\Image\Image $image
     * @return boolean
     */
   
public function execute($image)
    {
        return
imagefilter($image->getCore(), IMG_FILTER_GRAYSCALE);
    }
}