def _lut_mutate_mask(lut):
    '\n    Get a mask that shows which neighbourhood shapes result in changes to the image\n    :param lut: lookup table\n    :return: mask indicating which lookup indices result in changes\n    '
    return (lut != identity_lut())
Get a mask that shows which neighbourhood shapes result in changes to the image
:param lut: lookup table
:return: mask indicating which lookup indices result in changes
def _lut_mutate_mask(lut):
    '\n    Get a mask that shows which neighbourhood shapes result in changes to the image\n    :param lut: lookup table\n    :return: mask indicating which lookup indices result in changes\n    '
    return (lut != identity_lut())