How to use the sigal.signals.img_resized.connect function in sigal

def register(settings):
    if settings.get('copyright'):
        signals.img_resized.connect(add_copyright)
    else:
        logger.warning('Copyright text is not set')

def register(settings):
    if settings.get('adjust_options'):
        signals.img_resized.connect(adjust)
    else:
        logger.warning('Adjust options are not set')

def register(settings):
    logger = logging.getLogger(__name__)
    if settings.get('watermark'):
        signals.img_resized.connect(add_watermark)
    else:
        logger.warning('Watermark image is not set')