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Re: Processing Challenge 30 - A Bubble and a Cluster
Posted: Fri Apr 15, 2022 4:47 am
by yobbo89
i would like to have a go at your data but the link has expired, is it possible to update it ? thank you
Re: Processing Challenge 30 - A Bubble and a Cluster
Posted: Fri Apr 15, 2022 7:13 am
by Jockinireland
Hi Rob,
@yobbo89
That's strange, the links should not expire.
Try this one
https://1drv.ms/u/s!Alj6NhuYfZtW22sY9Sb ... -?e=kDO5Pq
Re: Processing Challenge 30 - A Bubble and a Cluster
Posted: Fri Apr 15, 2022 11:17 am
by yobbo89
i might give it another go,maybe smooth out oiii before combining , i did a 2x drizzle in sho
Re: Processing Challenge 30 - A Bubble and a Cluster
Posted: Fri Apr 15, 2022 8:15 pm
by Jockinireland
I really like that. Very different feel to it and beautiful detail.
Re: Processing Challenge 30 - A Bubble and a Cluster
Posted: Fri Apr 22, 2022 7:58 pm
by STEVE333
yobbo89 wrote: ↑Fri Apr 15, 2022 11:17 am
i might give it another go,maybe smooth out oiii before combining , i did a 2x drizzle in sho
Nice soft touch. Lovely
RGB stars.
Steve
Re: Processing Challenge 30 - A Bubble and a Cluster
Posted: Fri Apr 22, 2022 9:46 pm
by STEVE333
HOW EMBARRASING! I forgot I had already processed this once before and submitted it earlier this month! Don't get old if you can help it!
Here's my new SHO version using PixInsight.
PROCESSING STEPS:
Crop
Background extraction (ABE) on individual images
Noise reduction (MultiscaleLinearTransform) on individual images
Stretch images:
- Initial stretch with HistogramTransformation on individual images to match stars and background
- Create starless versions of SHO images and save the separated stars
- Use RangeSelection on starless O2 and S3 to create masks to select only important regions of nebulosity
- Finish stretching S2 and O3 images with the RangeSelection masks in place using HistogramTransformation
Create SHO image using ChannelCombination (Red=S2, Green=
Ha and Blue=O3)
Use SCNR to remove green
Increase color saturation using CurvesTransformation with the "S" option
Use HistogramTransformation to adjust black levels to achieve neutral background
Reduce noise with TGVDenoise and an inverted luminance mask to protect high-signal regions
Sharpen and enhance contrast of starless
Ha image
- Sharpen with MultiscaleLinearTransform
- Enhance contrast with LocalHistogramEqualization
Slightly blur SHO image using Convolution
Apply LRGBCombination to SHO image with sharpened
Ha image used as "L", leave
RGB unchecked
Combine
Ha and O3 stars as HOO image
Run ColorCalibration on HOO stars image
Add HOO Stars to SHO_LRGB image
DONE
Steve
Re: Processing Challenge 30 - A Bubble and a Cluster
Posted: Sat Apr 23, 2022 2:19 am
by AstroBee
Nice job guys. I like both versions better than my original go at it.
Steve, getting old sure beats the alternative.
Re: Processing Challenge 30 - A Bubble and a Cluster
Posted: Sat Apr 23, 2022 3:04 am
by STEVE333
AstroBee wrote: ↑Sat Apr 23, 2022 2:19 am
Nice job guys. I like both versions better than my original go at it.
Steve, getting old sure beats the alternative.
Yup! Don't like the alternative at all!!!
Here's a softer version of my last attempt.
Steve
Re: Processing Challenge 30 - A Bubble and a Cluster
Posted: Sat Apr 23, 2022 2:58 pm
by Jockinireland
STEVE333 wrote: ↑Sat Apr 23, 2022 3:04 am
AstroBee wrote: ↑Sat Apr 23, 2022 2:19 am
Nice job guys. I like both versions better than my original go at it.
Steve, getting old sure beats the alternative.
Yup! Don't like the alternative at all!!!
Here's a softer version of my last attempt.
These are great Steve. I think your third is my favourite as the bubble is so nice and crisp.
It always amazes me how we can get such different end results from the same data. What was the main difference in processing that resulted in the big change from your original version to these new, blue ones?
Rgds
Davis
Steve
Re: Processing Challenge 30 - A Bubble and a Cluster
Posted: Sun Apr 24, 2022 5:39 am
by STEVE333
Jockinireland wrote: ↑Sat Apr 23, 2022 2:58 pm
It always amazes me how we can get such different end results from the same data. What was the main difference in processing that resulted in the big change from your original version to these new, blue ones?
Rgds
Davis
I actually used the same general approach for the first and second images. I must have just stretched the Blue channel more when I did the processing for the second image. It wasn't a conscious processing choice! The third image is just the second image with the black level move up to hide the background noise and the color saturation reduced a little. Sorry, no real attempt to increase the blue. Just shows how even using the same approach doesn't always produce "identical" results.
Steve
Re: Processing Challenge 30 - A Bubble and a Cluster
Posted: Sun Apr 24, 2022 1:13 pm
by Jockinireland
STEVE333 wrote: ↑Sun Apr 24, 2022 5:39 am
Jockinireland wrote: ↑Sat Apr 23, 2022 2:58 pm
It always amazes me how we can get such different end results from the same data. What was the main difference in processing that resulted in the big change from your original version to these new, blue ones?
Rgds
Davis
I actually used the same general approach for the first and second images. I must have just stretched the Blue channel more when I did the processing for the second image. It wasn't a conscious processing choice! The third image is just the second image with the black level move up to hide the background noise and the color saturation reduced a little. Sorry, no real attempt to increase the blue. Just shows how even using the same approach doesn't always produce "identical" results.
Steve
Thanks Steve. I know what you mean. Infact I find it a bit disconcerting when I try to do an update to an image to add in some new data, planning to get to the same endpoint just better, and I end up with something not even close to the first one
I've now started saving everything as pixinsight project just so I can step back through the first process if I need to. But I'll soon need a new HDD.
Re: Processing Challenge 30 - A Bubble and a Cluster
Posted: Mon Apr 25, 2022 12:24 am
by STEVE333
Jockinireland wrote: ↑Sun Apr 24, 2022 1:13 pm
Thanks Steve. I know what you mean. Infact I find it a bit disconcerting when I try to do an update to an image to add in some new data, planning to get to the same endpoint just better, and I end up with something not even close to the first one
I've now started saving everything as pixinsight project just so I can step back through the first process if I need to. But I'll soon need a new HDD.
I have exactly the same problem David. Maybe we are the only ones who will admit it?
I haven't saved anything as a PixInsight Project for exactly the reason you mention - storage space!!!!
Good luck,
Steve