Quote:
Originally Posted by peeb61
I'm sorry I'm not familiar with pixel/file maths??
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No worries. You need to to do a bit of reading on the maths behind flat fielding. It's very simple arithmetic. Adding/subtracting and dividing.
Here's a good place to start. The bottom line is that subtracting the bias from your master flat will scale it correctly so when you divide it into your sub the correction will be properly weighted. Understanding calibration is critical to good imaging.