'Extract the keyword value from the card image.'

def _parse_comment(self):

    if ((self.keyword in Card._commentary_keywords) or self._invalid):
        return ''
    if (len(self._image) > self.length):
        comments = []
        for card in self._itersubcards():
            if card.comment:
                comments.append(card.comment)
        comment = ('/    ' + '    '.join(comments).rstrip())
        m = self._value_NFSC_RE.match(comment)
    else:
        m = self._value_NFSC_RE.match(self._split()[1])
    if (m is not None):
        comment = m.group('comm')
        if comment:
            return comment.rstrip()
    return ''
