Fal::deleteProcessedImages() 

\nn\t3::Fal()->deleteProcessedImages($sysFile = ''); 

Deletes all physical thumbnail files that were generated for an image incl. the data records in the sys_file_processedfile table.

The original image, which was passed as the $path argument, is not deleted. The whole process forces the thumbnails for an image to be regenerated if, for example, the source image has changed but the file name has remained the same.

Another use case: Cleaning up files on the server, e.g. because sensitive, personal data is to be data including all generated thumbnails should be deleted.

\nn\t3::Fal()->deleteProcessedImages( 'fileadmin/path/example.jpg' );
\nn\t3::Fal()->deleteProcessedImages( $sysFileReference );
\nn\t3::Fal()->deleteProcessedImages( $sysFile );
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| @return mixed

Source Code 

public function deleteProcessedImages( $sysFile = '' )
{
	if (is_string($sysFile)) {
		$sysFile = $this->getFalFile( $sysFile );
	} else if (is_a($sysFile, \TYPO3\CMS\Extbase\Domain\Model\FileReference::class, true)) {
		$sysFile = $sysFile->getOriginalResource()->getOriginalFile();
	}
	if (!$sysFile) return;
	if ($sysFileUid = $sysFile->getUid()) {
		$rows = \nn\t3::Db()->findByValues('sys_file_processedfile', ['original'=>$sysFileUid]);
		foreach ($rows as $row) {
			\nn\t3::File()->unlink("{$row['storage']}:{$row['identifier']}");
		}
		\nn\t3::Db()->delete('sys_file_processedfile', ['original'=>$sysFileUid]);
	}
}
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