public function importFromDisk ( $file, $bTrim=false, $hash=NULL )
    {
        // INCOMING is set in /index.php -- creates a temporary, working filename to be used to create thumbnails
//      echo 'hash: ' . ( is_null( $hash ) ? self::generateHash( basename( $file ) ) : $hash ) . '<BR>';
        $this->working = INCOMING . '/' . ( is_null( $hash ) ? self::generateHash( basename( $file ) ) : $hash );
//      echo $this->working.'<BR>';

        if ( file_exists($this->working) ) // does it already exist?
            unlink($this->working); // remove file


        if ( false === copy( $file, $this->working ) )
        {
            $this->working = NULL;
            throw new Exception('Unable to read file from disk');
        }

        // do we want to trim this image on import?
        if ( $bTrim )
            self::trimimage( $this->working );
    }