Process image sizes in PHP

$imageService = GeneralUtility::makeInstance(\TYPO3\CMS\Extbase\Service\ImageService::class);
$processedImage = $imageService->applyProcessingInstructions(
    $imageService->getImage($fileObject->getPublicUrl(), null, false),
    ['maxWidth' => $record['imagewidth'], 'maxHeight' => $record['imagewidth']]
);