0.90
#...
·
 |
|---|
|
Hi all, I'd like to ask for some feedback on my Pelican Nebula: https://www.astrobin.com/sbf9nw/C/ I had quite a lot of problems with this data (it was very humid) so I am happy to at least get something out. I also like the framing, which was one of first projects for me that I intentionally frame over multiple nights. I think, I had some problems with flat calibration which usually works for me flawlessly. Blue channel (Oiii) was all around the place so it make the background extraction really hard, so I did it manually with color masks (based on combined Ha + Sii). So I know it's not perfect, but at the end I was quite happy with that. I also had huge issues to get some usable stars (I know the Cyg 56 has a lot of strange patterns, I could maybe clean it up a little bit better). I used 'my standard' PixInsight flow (roughly): - Background extraction - Usually I'd do it ASAP, but I actually couldn't do it with DBE/ABE so I 'equalize' it later in the processing, I even tried it with Graxpert without luck - Combine SHO & RGB channels - StarXTerminator (throw away SHO stars & RGB starless) SHO starless: - BlurXTerminator - Stretch to linear - with STF + histogram transformation, I intentionally didn't stretch a lot, I prefer to do it later with Curves - ColorMask with original (starless) Ha+Sii (I use PixelMath to create mask) - lowering the background, trying to keep the lighter parts unchanges as much as possible - ColorMask with Magenta, Green & Cyan (to remove magenta color, do the blue-orange) - ColorMask green - to remove very green trend towards the left side (should usually be removed with background extraction) - Final curves (on full image and with color masks) RGB stars: - BlurXterminator (very easy processing but with 'correct first' option) - SPCC - Stretch to linear - manually with histogram transformation Combine SHO starless + RGB stars - light NoiseXTerminator for finalization Hopefully I didn't forget anything. |
1.81
#...
·
·
1
like
|
|---|
| This is better than most requests for criticism here. |
3.01
#...
·
·
2
likes
|
|---|
| I love the orientation and scale. For my taste, it has a muted / hazy feel. I'd probably create a L mask and use it inverted with histogram transformation and neutralize some of the background. Probably is the green/blue in the dark areas throwing me a bit. |
|
0.90
#...
·
|
|---|
Michael W. Dean: Thanks Michael, for your kind words! I wouldn't fully agree - there are really great images in RCC section  I am fairly happy with my Pelican Nebula but something I think is missing... and it was though data IMHO to work with but thanks again!I love the orientation and scale. For my taste, it has a muted / hazy feel. I'd probably create a L mask and use it inverted with histogram transformation and neutralize some of the background. Probably is the green/blue in the dark areas throwing me a bit. Hi jewzaam, I agree - this was the biggest struggle I had with this data. I will probably on one occasion use your advice and try to neutralize background even further (you should have seen it originally, how horrible it was  ). I used Ha+Sii as a mask for BG neutralization but probably if I extract L on final image and just try to suppres BG a little bit more, it could give great result!Thanks for good suggestion! |
