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Old 26-03-2020, 12:28 PM
RugbyRene (Rene)
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Eta Carina - redux

As I have a lot of time on my hands these days, I thought I'd experiment with a few things. So I fired up Startools and re-processed some data from earlier in the month to see if I could get a better result. I also used a new tool called Topaz DeNoise AI.

The first image is the result. Work in progress I think but I'm getting better.

Then I thought, hey let me try experiment with some things. So I downloaded Startnet++ to see what a starless Eta Car would look like (image 2).

It looks weird with no stars but I kind of like it.

What do you think?

Rene
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Old 26-03-2020, 02:23 PM
raymo
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I like them both, nice and sharp, but the brighter parts of the nebula need toning down as the brightness has almost wiped out the Homunculus, and
the stream of nebulosity that spurts out to one side of it. It is clearly visible
at the top of the single 30second sub that I have posted here.
raymo
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Old 26-03-2020, 04:12 PM
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Nikolas (Nik)
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It's a great overall shot but the highlights need to come down I can barely see the keyhole nebula.
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Old 26-03-2020, 05:06 PM
Startrek (Martin)
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Rene
Lovely image and well framed but looks a bit oversaturated
I notice your using Startools. I’ve been using Startools for over 3 years now ( still learning but getting good results with both good and noisy data ) Do you use the Autodev or the Develop module for your initial stretch and final stretch ?
As Carina is a very bright object , Autodev does a great job of bringing out fine detail whilst keeping the lid on noise and over saturation
I rarely use Develop it tends to “over expose” the image
Martin
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Old 27-03-2020, 07:58 AM
RugbyRene (Rene)
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Quote:
Originally Posted by Startrek View Post
Rene
Lovely image and well framed but looks a bit oversaturated
I notice your using Startools. I’ve been using Startools for over 3 years now ( still learning but getting good results with both good and noisy data ) Do you use the Autodev or the Develop module for your initial stretch and final stretch ?
As Carina is a very bright object , Autodev does a great job of bringing out fine detail whilst keeping the lid on noise and over saturation
I rarely use Develop it tends to “over expose” the image
Martin
Yeah I'm still learning how to use Startools. I might have a go a processing again today (got the time!). Now that I look at it I can see the core is blown out.

Rene
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Old 27-03-2020, 09:15 AM
Startrek (Martin)
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I’m happy to send you my ST workflow for my recent Carina ( I know our stacked image (data) would differ but still happy to offer my workflow ( you may get some useful information or tips out of it )
Let me know
Martin
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Old 27-03-2020, 10:02 AM
RugbyRene (Rene)
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Quote:
Originally Posted by Startrek View Post
Rene
I’m happy to send you my ST workflow for my recent Carina ( I know our stacked image (data) would differ but still happy to offer my workflow ( you may get some useful information or tips out of it )
Let me know
Martin
That would be fantastic. Thank you. I'll PM you with my email address.

Rene
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Old 27-03-2020, 10:45 AM
Startrek (Martin)
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Rene
I’d prefer to post it in this thread so others may see it and hopefully get some useful advice and tips ( I’m by no means an expert on Startools but I’m getting some good results out of it after using it for 3 years , still learning myself )
I use both version 1.4 and 1.5 linear data ( no narrowband at the moment )
Cheers
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Old 27-03-2020, 02:29 PM
RugbyRene (Rene)
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Did a re-process today. Managed to get more detail in the core. Also put in through Topaz Denoise AI & GIMP.

As I get better and get more data, I'll be able to pull pout more detail.
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Old 27-03-2020, 02:35 PM
Startrek (Martin)
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Here’s my Startools workflow on recent NGC 3372 Carina Nebula
2hrs integration
Startools V1.5
Deep Sky Stacker Stacked image fits file
NB: “Very Important ” Data must be linear , unstretched and not white balanced from your stacker

Open Startools import your data
Choose Linear data set ( far LHS )
Possible stacking artifacts OK
Note: Use Before and After modes to check your work and zoom in for closer inspection
Select “Bin” use default 50% then keep
Select “Autodev” then keep
Select “Crop” and drag your area to crop out stacking artifacts and other anomalies then keep
Select “Wipe” use default but increase dark anomaly to 8 pixels then keep ( Wipe is dependant on quality of data so you may have to increase or use vignetting mode ?? )
Select “Autodev” again for final stretch , select redo global stretch
Drag mouse over centre of image and form a rectangular area or Region of Interest ROI say use X1 700 pixels and Y1 500 pixels, increase Ignore fine detail between 2.5 to 3.0 pixels
Adjust your ROI to get best results for saturation and contrast
All other settings are default. Then keep
Select “Decon” and generate mask automatically
Increase Radius 1.8 to 2.0 pixels
Then keep , make sure you keep the mask do not clear it
Select “Sharpen” and increase amount 150% to 180% and leave other settings default . Adjust to suit then keep
Now Clear Mask
Select “HDR” use Algorithm Reveal DSO core and increase strength to 1.8.Use Algorithm Reveal All and increase strength to 1.5 then keep
Select “Life” then fill mask
Use Less More at 30% to 40% or Isolate at 30% to 40% to reduce noise and tone down the interstellar background
Select “Colour” and then create a mask with fat stars and then use Grow with 1 click. Invert the mask so stars are excluded
Use Artistic Detail Aware
Saturation 180% to 200 %
Dark Saturation increase to 3.00
Sliders increase colour bias
Red 1.10 to 1.15
Green 1.20 to 1.25
Blue 1.30 to 1.40
Remaining settings default
Then keep
Invert star mask and add colour to Stars if required ( I didn’t)
Then clear mask
Select “Tracking”
Stop tracking do final noise reduction ( use default or select another value to reduce noise clumps )
Select fill mask
Check final image and if happy save as png or jpeg
This is my workflow ( less a few minor tweaks) on my recent Carina based on my data
Hope the above provides some assistance or processing tips in Startools
Cheers
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Old 27-03-2020, 02:47 PM
RugbyRene (Rene)
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Thanks Martin.
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