Fal::process() 

\nn\t3::Fal()->process($fileObj = '', $processing = []); 

Calculates an image via maxWidth, maxHeight, cropVariant etc. Returns URI to the image as a string. Helpful for calculating thumbnails in the backend. Alias to \nn\t3::File()->process()

\nn\t3::File()->process( 'fileadmin/images/portrait.jpg', ['maxWidth'=>200] );
\nn\t3::File()->process( '1:/images/portrait.jpg', ['maxWidth'=>200] );
\nn\t3::File()->process( $sysFile, ['maxWidth'=>200] );
\nn\t3::File()->process( $sysFileReference, ['maxWidth'=>200, 'cropVariant'=>'square'] );
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| @return string

Source Code 

public function process ( $fileObj = '', $processing = [] )
{
	return \nn\t3::File()->process( $fileObj, $processing );
}
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