G'day Rick,
Thanks for the reply, appreciate the time. I actually put this same question on the PI forum site and to date nobody has come back to me which sort of was suggesting to me that it might have been all a bit too hard.
Anyway, when I did the master calibration files I simply followed the process in PI. I haven't subtracted the bias from the dark twice. Also, the image I'm trying to process now is the Sombraro galaxy, before that I did M78 and I used the same calibration files on it with no problems so it's a bit odd.
If you want to email me at I can then reply to you with the masters and some lights if you're happy to do that.
Cheers.
Quote:
Originally Posted by RickS
The dark frame optimization process depends on the data you are calibrating (it attempts to optimize SNR in the calibrated frames by adjusting the scaling of the dark master) so you can get different results with different data sets.
You haven't done something like subtracting the bias from the master dark twice, have you? If you calibrated the darks with bias subtraction when you created the master dark and then calibrated the lights with the box to calibrate the master dark ticked then that would happen...
Otherwise, if you can upload the master files and a few lights somewhere I'd be happy to take a look at them.
Cheers,
Rick.
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