699: some aftermath, set correct image id first time around.
defringe tuning: apply strength differently and tune some internal parameters
defringe tuning: correct wrong *2.0 in local average and have a minmax of 0.1f  + allow more strength
defringe tuning: apply strength exponentially instead
defringe tuning: correct out of bounds check in fib_latt (just for safety, should never really happen at runtime)