Quote:
Originally Posted by toryglen-boy
ok, now this is a FAR steeper learning curve than i thought ...
my flats come out in negative, white background with a dark splodge in the middle, and after trying an image of NGC 6357 (as its the redest thing i have ever seen) it came out blue! as did the Horsehead last night ...
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That's because you didn't subtract the bias prior to divide the flat into your light subs so you're over correcting. You need to calibrate your frames prior to do anything else. That is debayering & aligning.