@srosenfraz, personally I don’t have experience with IP, but I would think bias frames can’t be used for dark scaling since a bias frame is not a representation of any significant dark current.
Dark scaling is on my todo list, since APP can’t do this yet. But having said that, dark scaling should always be considered as a last resort. It’s always better to make good darks on the right temperature. But I know, especially for uncooled camera users, this can be a tricky business. Then dark scaling could help.
(If you use dark scaling, don’t use darks with exposures of a few seconds. Always use a master dark with a real and significant amount of dark current. )
Returning to your question ;-)…
Yes, APP will use the flat darks by default in this situation.
APP has strict rules on the master calibration files that can be applied to a frame that needs calibration:
a dark can only be subtracted by a bias of the same iso / gain
a flat can only be subtracted by
– a masterbias of same iso /gain
– a masterdark of same iso /gain and same exposure within a certain tolerance %
or BPM corrected
– by a BPM of the same image dimensions and instrument name.
The same rules apply to the calibration of a light frame
So if you have calibration frames of different iso values for the lights and the flats then APP will automatically apply the correct ones.
And it is always advisable to visually check the calibration, before proceeding to star analysis, with the image viewer option l-calibrated (above the image viewer) instead of showing the image only linear.