Pbootcms upload thumbnail size automatically reduces and blurs

In the use of pbootcms When the template uploads pictures , Thumbnails are automatically intercepted , The size becomes smaller, and the thumbnail does not match the background .
Solution
find /config/config.php file
find

//  Thumbnail configuration 
    'ico' => array(
        'max_width' => '2000',
        'max_height' => '1000'
    ),

Detailed explanation
max_width   // Is the maximum width
max_height  // Is the maximum height
You can put the size a little larger ,max_height If it is empty, it means that the size is not displayed .