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 use an Optolong L-Extreme with my OSC to gather Ha with RGGB/"Ha-Oiii extract Ha" and O3 with RGGB/"Ha-Oiii extract Oiii" and I also have an
Optolong L-Synergy filter which gathers Sii/Oiii. To produce SHO images I then need S2.
I have tried using the algorithm RGGB/Sulfur II (SII) and combining this result with the Ha and O3 extracted above.
I also tried using "supported/Adaptive Airy disc" to produce a color image and then extract the channels and use the red as S2. i then combine this either with the Ha and O3 as above - or I run "Ha-Oiii extract Color", extract channels, save the red as Ha and average the green and blue from both filters (via Pixelmath) to yield O3.
In all of the cases described above, there is a result but the colors are different.
My questions are:
a) is there one approach that's better than the other - whether more reliable or more faithful in the results?
b) what is the standard way of processing the Optolong L-Synergy in APP?
Tks
Gil
Hi Gil,
I am not an APP expert but I believe the way to process the L-Synergy filter would be to run the extract OIII algorithm so you could combine that with the OIII from the L-Extreme filter. Since there is no extract SII algorithm, I think you just run the extract Ha algorithm. Because you collected SII and it's red like Ha, APP will extract it thinking it's Ha and make a monochrome image of the SII data. You can then combine the Ha, OIII and SII images for a final SHO image. That is how I would do it. If anyone else has a different process, let us know.
Thanks, Tom
Hello Tom,
Tks for the suggestion, I understand your approach.
What holds me back is whether APP's extract-Ha has sufficient latitude to reach 16nm upwards and also grab SII's wavelengths.
I wouldn't know just by looking at the results...
I don't think it matters for APP. It is just extracting the red signal and since the red signal with the L-Synergy is SII, that's what it will extract. I could be wrong but I think I have seen this technique described in other posts.
Tom
Holy smokes!
I just installed beta39 and it seems to answer all my questions: it replaces the old extract algorithms by new "Multi-NB" ones that cover all of my needs (H-a, SII, SII+OIII, etc.)!
Kudos to Mabula!!
Sounds good. I haven't downloaded that yet-waiting for the final 2.0 myself. Good luck.
Tom
Tks Tom,
Indeed, the red channel simply records whatever emission falls in its sensitivity curve. The filter defines the passbands, and the red channel happens to capture SII instead of Ha because of the filter’s design. Since Ha isn’t passed, the red channel contains SII instead.
I was wondering if APP models the filter transmission and camera QE to isolate SII vs OIII more precisely.
Gil
Hi Gilles @museceleste and Tom @tfergu01 & @timjburgess,
Indeed, beta39 has the new algorithms to extract all the different NarrowBand wavelenghts.
I was wondering if APP models the filter transmission and camera QE to isolate SII vs OIII more precisely.
No, it is just like Tom indicates, to get H-alpha or S-II we only need to grab the red channel. There is no need to model transmission and camera QE to achieve the proper extraction of the right data.
Mabula
