|
Over/under correcting in flats in my experience is usually caused by other calibration frames not correctly correcting the flats; most notably dark/bias calibration.
The other simpler one can be having the "Optimize" ticked under "Master Dark" during image calibration. Optimize shouldn't be selected by the way.
Given your calibration process, I'd just simply ditch the bias frames and try again. Remember, as long as your dark frames as the same length as your flats then they contain both the bias and dark signal so bias frames become useless. The only time that bias frames are actually useful is if you want to scale your dark frames which doesn't work with 95% of CMOS sensors as they have a non-linear progression of dark current.
|