Adapter.php

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<?php
namespace Magento\Config\Model\Config\Backend\Image;

class Adapter extends \Magento\Framework\App\Config\Value
{
    protected $_imageFactory;

    public function __construct(
        \Magento\Framework\Model\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Framework\App\Config\ScopeConfigInterface $config,
        \Magento\Framework\App\Cache\TypeListInterface $cacheTypeList,
        \Magento\Framework\Image\AdapterFactory $imageFactory,
        \Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
        \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        array $data = []
    ) {
        parent::__construct($context, $registry, $config, $cacheTypeList, $resource, $resourceCollection, $data);
        $this->_imageFactory = $imageFactory;
    }

    public function beforeSave()
    {
        try {
            $this->_imageFactory->create($this->getValue());
        } catch (\Exception $e) {
            $message = __('The specified image adapter cannot be used because of: %1', $e->getMessage());
            throw new \Magento\Framework\Exception\LocalizedException($message);
        }

        return $this;
    }
}