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.
I've got data from 2 nights on IC1396, with my modded Canon 500D. So far so good. But I find it hard to remove the light polution, since there are very little places without nebulosity. Maybe I'm nog getting something, but I'm not pleased with the results.
I know I sould make the boxes in areas with no or little nebulosity, but haven;t got much of those haha. Anyone with a hint or tip is welcome ofcourse!
Yes, that's quite challenging indeed. What helps me in these cases is to first over-stretch the data (on the right-hand side select the box right under the switches for DDP, auto and saturation) to 30% BG. Switch on saturation and then go down the right-hand side and slide the Sat-slider (amount of saturation) to the right and the Sat.TH (saturation threshold, to protect the background from saturating), more to the left. This will show, hopefully, as much of nebulous data as possible and the ares where that signal is the lowest. I then place the boxes there. You can always perform the LP correction, remove the boxes and slightly change them according to what you then see as a result. You can check if the model is somewhat correct by clicking on the big "Show corrected image" button, this will show the gradients APP thinks are in the image, based on the location of the boxes. The correction should ideally be a smooth gradient, or gradients.
Vincent, just getting into the BG Calibration and LP removal. I find that BG Calibration doesn't do all that much but the Remove LP works fairly well. From what you have said above, do I understand correctly that these tools will work better with more stretch, more Sat and less Sat TH?
Also with regards to Removing LP, what actually does the "Flexibility" Slider do? I have used it at both extremes and see little to no change in the image.
When selecting boxes, is it better to use more small boxes or fewer larger boxes. I am having slightly better results with more as in 20 or 30 smaller boxes, much like what would be used in PI and their DBE tool. Sorry didn't mean to swear, I let my PI trial run out, went with you guys instead.
The tools don’t work better, but with over stretching and over saturation you are able to see what the true background is a bit better. And also where the problem areas are. You can then put the boxes on those areas.
The flexibility, I think, relates to how strict the model is in calculating the background. But I’m not a mathematician so that would be one for Mabula. 😉
You can start with a few large boxes, a normal gradient should then already be corrected pretty well. With more gradients in the image or smaller effects, smaller boxes might help in getting a better “resolution” for the model to work with. If that works better depends on the data you have.
