20 January 2021: Soon to be released APP 1.083-beta2 : improved comet registration, updated tools, new Star Reducer Tool and more...
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[Sticky] Combining R, G, B with Ha & OIII data using an Optolong L-eNhance filter
14. When registration is complete, click on Normalize (tab 5), click on Normalize lights. When complete, click on Save Normalized Frames.
I keep getting an error when I get to this point.
I've got the same error at the exact same point, both to the 1.082 & 1.083 b1.
I have imported 2 fits files (one RGB one Ha), created with APP.
Ok I've just found the answer on another post. You have to SPLIT the RGB data and then combine them all together.
That is correct. Split the RGB files in the calibrate tab. Then load the individual RGB and Ha and OIII files. Then Analyze Stars, Register and Normalize. You can then load the normalized files into the RGB Combine tool.
@euripides Thanks for letting us know that you found a solution.
After searching the forum I've seen the exact same error, in multiple threads with multiple titles, but not a solution. I thought that I have to link the solution back here for future reference 😀
So now after spending hours reading and trying different settings and methods, I have a question:
I use a modded DSLR with a SkyTech Triband filter and aa Ha 12nm filter, in a Bortle 8-9 area - so imaging without a filter is not an option... For the Ha filter things are easy, I choose the Ha algorithm.
But which is the best approach for the Triband?
3 different integrations and then combine with the data from Ha filter?
a) Ha-OII color for RGB
b) Extract Ha for Ha
c) Extract OII for OII
It depends on what you want to do. If you want to create a "natural" RGB image then Ha-OIII Color should be used. This separates the red channel from the green and blue channels in a better way than the default Adaptive Airy Disk algorithm. If you want to create an HOO image then you should create two stacks (one with Ha-OIII extract Ha and one with Ha-OIII extract OIII) and then use the HOO 1 or HOO 2 formulas in Combine RGB in tab 9 TOOLS.
Thank you. The cookbook approach worked nicely. Especially since this was a $81 Warehouse Special 80mm scope
I have the Lextreme. Could the same be done using this filter?
@bungle78 Yes, you can separate Ha and OIII for the data taken with this filter and then combine them again as you see fit.
....I want to extract Ha and OIII from my L-eXtreme subs.
What ist the difference between (settings tab 0) Ha - OIII color mode and Ha - OIII separate Ha (or OIII)
or: what does the Ha - OIII color mode do exactly?
Thanks in advance
@peter-s The difference is that Ha - OIII Color will create a color image with R represented by the Ha signal and G and B by the OIII signal. It is similar to, but slightly different from, the default Adaptive Airy Disk. By using Ha - OIII separate Ha (or OIII) the Ha (or OIII) signal gets extracted producing a mono image.
When you extract both Ha and OIII, you can go to tab 9 and select Combine RGB. There you can select the HOO 1 or HOO 2 formula to combine the Ha and OIII signal in a different way. You can even play with the amounts in which the Ha and OIII signal contribute to the R, G and B channels to create your own mixtures of colors.
by the way a question concerning the workflow (post1):
Ha and OIII Integration
4. Now for the narrowband images. Clear everything out of APP and on Tab 0 (Raw/Fits), click on your correct debayer pattern (mine is RGGB).
5. For the algorithm, select Ha-OIII extract Ha.
6. Click on Load (tab 2) and enter your lights, etc. for your L-eNhance frames and appropriate calibration frames.
7. Click on Register (tab 4) and select Use Dynamic Distortion Correction.
8. Click on Integrate (tab 6) use the automatic parameters. Click on Integrate.
9. Once the integration is complete for the Ha file, clear the data once more, go to tab 0 and select the Ha-OIII extract OIII algorithm. Reload the same data, but now for the OIII signal. Click integrate in tab 6 and this will integrate your OIII data.
10. When the OIII is complete you now have 5 files: R, G, B, Ha, and OIII. Now the files must be registered and normalized together so that you can combine them.
As soon as I click one of the extract options (in tab 0) APP tells me to normalize all frames.
Do I have to calibrate + star stearch + register + normalize all frames before integrating for Ha / OIII?
@peter-s APP indeed asks that and you can go straight to tab 6 and click Integrate. No need to manually go through each step separately.
the Color mode is faster than extracting Ha and OIII separately.
the results themselfs are equal? What do you suggest?
@peter-s That depends on what you want to do. If you are satisfied with the colors that result from using the color mode then great. If you want to combine the Ha and OIII channels in a way that you want to influence, then you'll need to extract the channels and then recombine them again in tab 9 RGB Combination. There you can specify how much of each channel will be visible in which color which gives you great flexibility to do whatever you like.
@wvreeven yes I want to recombine them = I have to split the channels after extracting in color mode.
My question is if the APP process of extracting Ha and OIII is the same both ways (color mode or separately).
@wvreeven with the extreme if I was wanting to to do a HaRGB image what algorithm would be best to create an RGB image to split the channels from?
@bungle78 Just use the default Adaptive Airy Disk algorithm. By the way, not trying to be patronizing but when you hover your mouse over the drop down you'll get a help popup explaining all the algorithms 🙂
This algorithm-dropdown menu shows several options. Am I right that we can call these options "debayering options"? I assume now that your answer is "yes". This debayering takes place during loading-the-frames. So we can say that APP starts the calibration process with debayered frames. Somewhere on the internet I read that debayering must be done before stacking (of course!), but after calibration! So I am amazed about this APP-approach. Can you explain this in some detail? E. g. what about the darks, and the bias-frames, and the flats? If I choose option "Extract Ha", the calibration must be done in a way that differs from calibration-when-extract-O3 is chosen. Isn't it?