Quote:
Originally Posted by gregbradley
Hi Mike,
I think you have it just right in my opinion. I consider myself well informed on the Vela SNR as I have taken several images of it last year and just finished taking 15 hours of it myself yet to be processed fully. So in total something like 30 hours of imaging this region.
The area is primarily an O111 region not a Ha region hence your blue.
The Ha areas are more the 2 gum nebulas a fair way above and to the left of your image area and possibly the lower more solid areas below and to the left of your image area.
In my O111 subs the background shows extensive O111 gas as well as detail in the filaments that only come out with O111. Ha tends to be more vague in the SNR and a bit general although some structure. My images will be O111 LRGB.
So the reason then I conjecture that you are getting blue backgrounds is you have picked up the general O111 emission in your blue subs and they form a general blue background which is not a gradient but something your camera actually picked up.
I also wonder (I didn't actually test it) whether it is more productive to use 2x2 on the luminance and Ha or O111 as the area is fairly dim especially the luminance which picks up hardly any of these filaments.
The filaments jump out in O111 though and show good detail. Even a 60 second image shows some filament detail in O111.
Cheers,
Greg.
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Of course, you're right, the reason I don't seem to be able to change it to what my minds eye percieves to be correct is becasue..well...it is probably already pretty much ok.
Mike
I had thought'a that but wasn't so pretentious to suggest it, so thanks
