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

namespace Intervention\Image\Imagick\Commands;

use
Intervention\Image\Commands\AbstractCommand;

class
OpacityCommand extends AbstractCommand
{
   
/**
     * Defines opacity of an image
     *
     * @param  \Intervention\Image\Image $image
     * @return boolean
     */
   
public function execute($image)
    {
       
$transparency = $this->argument(0)->between(0, 100)->required()->value();
       
       
$transparency = $transparency > 0 ? (100 / $transparency) : 1000;

        return
$image->getCore()->evaluateImage(\Imagick::EVALUATE_DIVIDE, $transparency, \Imagick::CHANNEL_ALPHA);
    }
}