Fal::getImage() 

\nn\t3::Fal()->getImage($src = NULL); 

Retrieves / converts to a TYPO3CMSCoreResourceFileReference object (sys_file_reference) "Smart" variant of \TYPO3\CMS\Extbase\Service\ImageService->getImage()

\nn\t3::Fal()->getImage( 1 );
\nn\t3::Fal()->getImage( 'path/to/image.jpg' );
\nn\t3::Fal()->getImage( $fileReference );
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@param string|\TYPO3\CMS\Extbase\Domain\Model\FileReference $src
@return \TYPO3\CMS\Core\Resource\FileReference|boolean

Source Code 

public function getImage ( $src = null )
{
	if (!$src) return null;
	$imageService = \nn\t3::injectClass( ImageService::class );
	$treatIdAsReference = is_numeric($src);
	if (is_string($src) || $treatIdAsReference) {
		return $imageService->getImage( $src, null, $treatIdAsReference );
	}
	return $imageService->getImage( '', $src, false );
}
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