Quote:
Originally Posted by Merlin66
Subtraction is usually used for Dark corrections, and the flats are always normalised then divided into the Lights.......
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yes i think that is the case when doing full callibration (master bias, darks and flats or no flats) this question was simply for flats from a light stack in PS. happy to be corrected but as you could see it works fine - well in the case of an artificial flat anyway.