I have started back on the mono scene again, and did some narrowband imaging last night, The Helix. Started shooting Ha, S2, and O3, but when I saw the S2, I abandoned this as there was virtually zip on the image. Ha, and O3 however were bright, looked good.
So the question is, what is "normal", heck is any of this normal, when it comes to combining the respective channels.In my case from last night I only ended up with Ha, and O3, plus a measly 300 second sub of L.
But assuming I had all three, what channel becomes what?
Below is a couple of trials, no real processing, just a quick look.
Gary
Sii is always hard to get. Normally you do Sii as Red, Ha as Green and Oiii as Blue. But if you have only Ha and Oiii you can try Ha as Lum Ha as Red, Oiii as Green and again Oiii as Blue. That should give you a nice red pic with tints of blues.
Also, with narrowband, dont bother with a L channel... use Ha or OIII or a blend of both as a luminance. I've seen methods online of using Tone Mapping to create a Lum channel from SII Ha and OIII data... I would imagine this can be applied to just Ha and OIII if thats all you have to work with... I'll dig up the link for you shortly..
Using Ha Ha OIII OIII as L R G B works well... also you could try blending Ha with OIII with a ratio of say, 70:30 as the green channel, and using straight Ha for R and OIII for B.
There are many techniques out there, and the beautiful thing about narrow band is that none of them is either right or wrong... Just different.
