UPDATE FROM MABULA
I have had a very rough 2 months unfortunately health wise. I was struck 3x in a row with bacterial infections. The second infection occurred after a routine hospital checkup and I became very sick. I had to rest and take a lot of antibiotics. Once I was recovering and restarting work 1 month ago, I again became sick. The infection was not yet gone, so even more antibiotics and rest was needed. Needless to say, it took a lot of my energy and I needed a lot of rest.
Finally, the infection is really gone and my energy is coming back step-by-step now and I have started work again. I am terribly sorry to have kept you waiting for support. I will address all outstanding questions and e-mails step-by step and will be on the forum daily from today.
APP 2.0.0-beta47 will come soon as well, a lot of work was already completed before I became very ill, so the release is also nearly ready for you. Beta47 will be much faster actually. Many workflows will be more than 2x faster, mosaics can even be 10x faster than before because registration really received a major boost... all compared to beta46. Before I release it, I will make sure that everything is working properly and then I will release it.
Hi,
I often did not use flats in the past because I had no problems with dust and the very weak vingnetting in my system could easily be removed with the great light pollution remove tool in tab #9.
Actually I am taking part in a coordinated project and need to share old data as calibrated data to the other partners who use a different software. So I tried making artificial flats with the "correct vignetting" tool which delivers nice flats as it seems. As it is important to share the best quality possible I would be glad if someone would check wether or not the following workflow is correct:
01 load the uncalibrated lights
02 load masterdark (MD)
03 load masterbias (MB)
04 load bad pixel map (BPM)
05 calibrate lights with masterdark and masterbias in tab #2
06 save dark-calibrated files in tab #2
07 remove light frames from list
08 load dark-calibrated files
09 choose one representative sub
10 apply the "correct vignetting" tool in tab #9
11 save with option"save artificial flat" checked
12 remove the lights from the file list
13 load the uncalibrated lights
14 calibrate the lights in tab #2 with MF(art.), MD, MB, BPM in place
15 save calibrated files in tab #2
16 share calibrated light only, no need to share the calibration files
Many thanks in advance 🙂
CS Pete
So Mabula once shared the following advice regarding the creation of an artificial flat:
On all lights if you make an artificial master flat, select "create artificial flat". This will save the correction model as an artificial Master Flat. You can then use this Master Flat, just like an original master flat to correct the vignetting.
To get the most accurate result, first calibrate the lights with a master dark or master bias (create masters & assign to lights button, tab 2). Save these calibrated files (tab 2 all the way down). Then clear APP or reload APP and make the artificial flat using one of the calibrated frames (load in 1 of the calibrated lights). Then load in all the calibrated lights and add the artificial flat, calibrate again and see if that works.
Thing is though, if you don't need flats and it looks fine already, I'd say that is better than adding an artificial flat maybe.
Thank you very much for the fast response, Vicent!
So your advice is to calibrate the already (pre-)calibrated subs using only the artificial flat (using no master dark and master bias). That makes much sense if the flat does not contain any readnoise by its nature. In that case the calibration warning that APP generates does not apply and can be ignored?
You wonder why I try to make artificial flats while my images look fine without flats. For me the processing was fine without flats because I could use the gradient removal tool on the integrations of only my own data. The plan here is to stack and combine different sets of data from different imagers. Some will work in APP, otzers in PI. So I worry that my data that are shot without flats would inject gradients and/or make problems for the others. That is why I'd like to share calibrated data - ready to use so to say.
Thanks again!
Pete
T
Yes, it should work like that indeed. Do have to say I never use an artificial flat, so if anything doesn't work out, let me know. 🙂
Yes, when sharing data it's nice to have the best data you can get indeed. Point taken.
