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NGC7000 in Cygnus  

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(@hoffi1981)
Molecular Cloud Customer
Joined: 2 years ago
Posts: 5
June 13, 2020 23:41  

Hi,

this is my first try with my just modified X-T3 Full Spectrum, under astronomical twilight because of my location on 2020-06-12.

Equipment used was a XF90mm F2 steppt down to F4, and the Sky Watcher Star Adventurer.

6000s @120s each, 50 integrated Files

The workflow was good (APP 1.080-beta2), I just had a greenish tint to the picture, nothing severe but noticeable. And well to handle in post.

Hop you like the picture. Suggestions for improvement?

 

Christoph

NGC7000

 

This topic was modified 12 months ago by Mabula-Admin

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(@vincent-mod)
Universe Admin
Joined: 4 years ago
Posts: 3392
June 14, 2020 13:05  

This is RGB right? You could try to perform Light Pollution correction to maybe get a more even result and when it's broadband data, star color calibration.


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(@mabula-admin)
Universe Admin
Joined: 4 years ago
Posts: 2618
June 14, 2020 14:38  
Posted by: @hoffi1981

Hi,

this is my first try with my just modified X-T3 Full Spectrum, under astronomical twilight because of my location on 2020-06-12.

Equipment used was a XF90mm F2 steppt down to F4, and the Sky Watcher Star Adventurer.

6000s @120s each, 50 integrated Files

The workflow was good (APP 1.080-beta2), I just had a greenish tint to the picture, nothing severe but noticeable. And well to handle in post.

Hop you like the picture. Suggestions for improvement?

 

Christoph

NGC7000

 

@hoffi1981, Excellent result, thanks for sharing ! Great to see a Fujifilm X-Trans result 🙂

Like @vincent-mod, suggests, have you used both the Remove Light Pollution tool and Star Color Calibration in APP? If not, please try or ask us to do it for you as an example to demonstrate the capabilities of APP.

Mabula


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(@hoffi1981)
Molecular Cloud Customer
Joined: 2 years ago
Posts: 5
June 14, 2020 16:25  

new Version with Remove Light Pollution tool and Star Color Calibration used. Not so experienced with that. So most likely you could do better.

NGC7000 2

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(@mabula-admin)
Universe Admin
Joined: 4 years ago
Posts: 2618
June 14, 2020 22:41  
Posted by: @hoffi1981

new Version with Remove Light Pollution tool and Star Color Calibration used. Not so experienced with that. So most likely you could do better.

NGC7000 2

Hi Christoph @hoffi1981,

Thanks for showing this, I think it is lacking quite a bit of color compared to your first result, perhaps you did not apply any saturation on the result this time?

 

Please share the integration/stack and I will try to do it and share with you how I would do it 😉

You can upload it here:

https://ariesprodstor.astropixelprocessor.com:7001/

login and password: appuser

Make a folder with your name and give me a sign once uploaded and I will report back with the result soon !

Mabula

 


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(@mabula-admin)
Universe Admin
Joined: 4 years ago
Posts: 2618
June 19, 2020 17:08  

Hi Christoph @hoffi1981,

Thank you for sharing your data, I have processed it and present you my result here, 100% APP:

So, we only have light frames, I simply integrated all with APP's fully automatic integration settings. Load light frames, go to 6) Integrate, click on Integrate and we get this:

Integration of light frames

We see a fair bit of light pollution/gradients and some greenish cast on this initial result.

So next step, load the integration into the 9) Remove Light Pollution tool:

RemoveLightPollution

To correct the data nicely, I purposely stretch and saturate very strongly ! That way, I can easily see what I want to correct 🙂

The image is now corrected for Light Pollution/gradients and also it is automatically Background Calibrated by the Remove Light Pollution tool, I now want to correct the colors with the 9) Star Color Calibration tool:

StarColorCalibration

Looks already much better 🙂 For instance, Deneb is now rather blue which is the correct color, Deneb is the bright star above the North America Nebula. Finally, I want to get rid of some greenish and magenta casts on some of the stars in the very dense star fields, I used APP's Selective Color tool, selected green, injected magenta and killed green's saturation. I then selected magneta and injected some green into those pixels. Both operations actually reduce the green and magenta in the image.

Finally I applied the final stretch in APP with enhanced color saturation & contrast:

SelectiveColor FinalStretch

Then saved the stretched result as JPG with 100% quality and sRGB color profile:

ngc7000 RGB session 1 SC St

Hope you like the result? You can download my results here to check all my steps 😉 :

https://apastropixelprocessordl.s3.eu-central-1.amazonaws.com/Christoph-Hoffmann-NGC7000-by-Mabula.zip

Cheers,

Mabula

This post was modified 12 months ago by Mabula-Admin

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(@hoffi1981)
Molecular Cloud Customer
Joined: 2 years ago
Posts: 5
June 21, 2020 10:50  

Hi Mabula,

thx for the very nice processing. I can see that there is still a lot to learn in color calibration for me. But so is life 🤔 .

I just had a idea to simplify this process for beginners. I see that the calibration with a tool that can show you the spread of the stars in the main row is very powerful, but difficult to handle in the beginning.

My idea is if you have in your picture, with broadband data (no Narrowband), a given star like Deneb or Beteigeutze. Pick the color (if not burned out of course) and calibrate Data withe a Spectroscopic reference (from a scientific source) to get a starting point. And fine tune from there. This could be for the 100-200 or so brightest Stars. Beginners normally start with wide field so you should find at least one of the stars in the Frame.

I know that you can make things worse if you select the wrong reference Star.

I am curious what you think about this idea. And i have no idea how difficult it would be to implement this in your program.

Christoph

 


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(@vincent-mod)
Universe Admin
Joined: 4 years ago
Posts: 3392
June 21, 2020 12:14  

I think the way APP is doing the calibration is more consistent and precise. What it does is it takes all selected stars and plots them on the graph, we know that main sequence stars behave in a very predictable manner (black body radiation, represented by the green line) and you should expect the lower graph to have some in the lower left (more blue stars) and most in the upper right (more red) on a more or less linear line. Given filters used or other effects are not changing the data too much, this gives an excellent starting point. Sometimes filters will influence the data somewhat, you can then change that a little by changing the position of the lines through the star population.


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