ImageDimensionViewHelper.php

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<?php
namespace TYPO3\CMS\Install\ViewHelpers\File;

class ImageDimensionViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper {

    public function render($dimension = 'width') {
        if ($dimension !== 'width' && $dimension !== 'height') {
            throw new \TYPO3\CMS\Install\ViewHelpers\Exception(
                'Dimension must be either \'width\' or \'height\'',
                1369563247
            );
        }
        $absolutePathToFile = $this->renderChildren();
        if (!is_file($absolutePathToFile)) {
            throw new \TYPO3\CMS\Install\ViewHelpers\Exception(
                'File not found',
                1369563248
            );
        }
        $actualDimension = getimagesize($absolutePathToFile);
        if ($dimension === 'width') {
            $size = $actualDimension[0];
        } else {
            $size = $actualDimension[1];
        }
        return $size;
    }
}