DemoFilter.php

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<?php
 
namespace Intervention\Image\Filters;
 
class DemoFilter implements FilterInterface
{
    const DEFAULT_SIZE = 10;
 
    private $size;
 
    public function __construct($size = null)
    {
        $this->size = is_numeric($size) ? intval($size) : self::DEFAULT_SIZE;
    }
 
    public function applyFilter(\Intervention\Image\Image $image)
    {
        $image->pixelate($this->size);
        $image->greyscale();
 
        return $image;
    }
}