ImageInfo.php

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<?php
namespace TYPO3\CMS\Core\Type\File;

use TYPO3\CMS\Core\Imaging\GraphicalFunctions;
use TYPO3\CMS\Core\Utility\GeneralUtility;

class ImageInfo extends FileInfo {

    protected $imageSizes;

    public function getWidth() {
        $imageSizes = $this->getImageSizes();
        return $imageSizes[0];
    }

    public function getHeight() {
        $imageSizes = $this->getImageSizes();
        return $imageSizes[1];
    }

    protected function getImageSizes() {
        if (is_null($this->imageSizes)) {
            $this->imageSizes = getimagesize($this->getPathname());

            // Fallback to IM identify
            if ($this->imageSizes === FALSE) {
                $this->imageSizes = $this->getGraphicalFunctions()->imageMagickIdentify($this->getPathname());
            }

            // In case the image size could not be retrieved, log the incident as a warning.
            if (empty($this->imageSizes)) {
                $this->getLogger()->warning('I could not retrieve the image size for file ' . $this->getPathname());
                $this->imageSizes = array(0, 0);
            }
        }
        return $this->imageSizes;
    }

    protected function getLogger(){
        $loggerManager = GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Log\\LogManager');

        return $loggerManager->getLogger(get_class($this));
    }

    protected function getGraphicalFunctions() {
        static $graphicalFunctions = NULL;

        if ($graphicalFunctions === NULL) {
            $graphicalFunctions = GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Imaging\\GraphicalFunctions');
        }

        return $graphicalFunctions;
    }
}