IC405/IC410/IC417 and NGC1931 6 panel mosaic  

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 Tony
(@tonymacc)
Red Giant Customer
Joined:1 year  ago
Posts: 84
March 4, 2018 15:28  

First mosaic in a while and its sort of not worked out well, top left corner has some issues so its bang head against the wall time. Other than that its stitched very well.

6 panels comprising 15 x 20 min subs with Astrodon 3nm Ha.

IC405 IC410 resizeimage


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(@mabula-haverkamp-administrator)
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March 18, 2018 13:28  

Beautiful 😉 @tonymacc

Great composition ! I think you refer to the dark patch top left? Can't you correct is properly with the Remove Light Pollution tool?

Mabula

Main developer of Astro Pixel Processor and owner of Aries Productions


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 Tony
(@tonymacc)
Red Giant Customer
Joined:1 year  ago
Posts: 84
May 17, 2018 14:01  

Hi @ Mabula, cant sem to get rid of that corner, its like it has been clipped but it is not. In another program (cough) it is likely to be the dna linear fit is not good.


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(@mabula-haverkamp-administrator)
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May 17, 2018 19:35  

@Tonymacc, if you want me to have a look at the problem in detail, you will need to send me the mosaic panels I think as they were created in APP.

Did you create the individual mosaic panels first? Perhaps you can share those or at least the problematic one and it's neighbours?

Then I will be happy to have a look.

Mabula

Main developer of Astro Pixel Processor and owner of Aries Productions


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 Tony
(@tonymacc)
Red Giant Customer
Joined:1 year  ago
Posts: 84
May 17, 2018 22:53  
Posted by: Mabula Haverkamp - Admin

@Tonymacc, if you want me to have a look at the problem in detail, you will need to send me the mosaic panels I think as they were created in APP.

Did you create the individual mosaic panels first? Perhaps you can share those or at least the problematic one and it's neighbours?

Then I will be happy to have a look.

Mabula

@Mabula, 6 stacks and a completed mosaic in the dropbox file.


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(@mabula-haverkamp-administrator)
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May 21, 2018 14:49  

Hi Tony @tonymacc,

I had a look at your mosiac data, first of all... very nice data 😉 !

I created the mosaic from the individual panels, that was no problem. I started with integration without MBB and LNC, just to see how much the panels actually overlap:

initial integration without MBB LNC

Then I integrated with MBB 10%, because the overlap is roughly 10%, and LNC 2nd degree 5 iterations:

Integration with MBB LNC

So the panels blend into each other well now, we only need to correct the final gradients that are left with the Remove Light Pollution tool. I first rotated the mosaic 90 degrees Counter Clock Wise to match your orientation:

Gradient Correction with RemoveLightPollution Tool

The top left corner is not messed up as far as I can see. The data isn't clipped on the black point.

The mosaic that I end up after tweaking the DDP settings in original size:

TonyMacAvoy final LQ
TonyMacAvoy final invert

And downscaled with a factor of 0.35x:

TonyMacAvoy final small
TonyMacAvoy final small invert

This looks pretty good to me 😉

Could you indicate why you thought that the top left data had a problem? Perhaps this is due to only seeing a preview of the data with the preview filters, while the actual data is still linear? If the gradients aren't fixed and the data is stretched, parts of the image could look too dark.

Kind regards,

Mabula

Main developer of Astro Pixel Processor and owner of Aries Productions


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 Tony
(@tonymacc)
Red Giant Customer
Joined:1 year  ago
Posts: 84
May 21, 2018 18:59  
 

Could you indicate why you thought that the top left data had a problem? Perhaps this is due to only seeing a preview of the data with the preview filters, while the actual data is still linear? If the gradients aren't fixed and the data is stretched, parts of the image could look too dark.

Kind regards,

Mabula

That could possibly be why, thankyou for having a look @Mabula, I can now go back and have another go, I have the o3 and s2 also now so I will attempt colour next. I really need to sit down and spend some more time with app, there is lots to learn.


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(@mabula-haverkamp-administrator)
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May 22, 2018 13:19  

Excellent Tony @tonymacc 😉

To create the multi-channel mosaic, check this video:

https://www.astropixelprocessor.com/how-to-create-a-multi-channel-mosaic-by-mabula/

Load the mosaic panels of all channels and register the multi-channel mosaic.

Looking forward to your results 😉

Mabula

Main developer of Astro Pixel Processor and owner of Aries Productions


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 Tony
(@tonymacc)
Red Giant Customer
Joined:1 year  ago
Posts: 84
May 25, 2018 11:28  

Not sure what happened there @Mabula, but it was late in the evening trying to process.

20180524 223339


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 Tony
(@tonymacc)
Red Giant Customer
Joined:1 year  ago
Posts: 84
May 26, 2018 10:45  

Any idea what happened there @Mabula ? That was supposed to be a bi-colour. The mosaic merged perfectly and is registered, this was the result of the rgb combine tool, I assigned the ha to green and o3 to blue, the sliders were also not changing anything.


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(@mabula-haverkamp-administrator)
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May 28, 2018 14:49  

Dear Tony @tonymacc,

Think about it, if you only assing the 2 channels to G and B, then the Red channel in the composite is 0 everywhere. You will need to assing it to the red channel as well to be able to get a normal grey sky background.

So perhaps you should try this, start RGB combine tool and:

  1. assign Ha to green
  2. assign 03 to blue

just like you did, and then

3. mix the Ha data in the red channel as well, by applying Ha to red as well for 100%. That should give you an initial starting point with a grey sky background.

Let me know if this helps and clarifies the green/blue result that you showed.

Kind regards,

Mabula

Main developer of Astro Pixel Processor and owner of Aries Productions


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 Tony
(@tonymacc)
Red Giant Customer
Joined:1 year  ago
Posts: 84
May 29, 2018 21:48  
Posted by: Mabula Haverkamp - Admin

Dear Tony @tonymacc,

Think about it, if you only assing the 2 channels to G and B, then the Red channel in the composite is 0 everywhere. You will need to assing it to the red channel as well to be able to get a normal grey sky background.

So perhaps you should try this, start RGB combine tool and:

  1. assign Ha to green
  2. assign 03 to blue

just like you did, and then

3. mix the Ha data in the red channel as well, by applying Ha to red as well for 100%. That should give you an initial starting point with a grey sky background.

Let me know if this helps and clarifies the green/blue result that you showed.

Kind regards,

Mabula

Hi @Mabula, ah yes, sorted now. This now creates another question, is there a way that we can see the colours change as you move the sliders? as opposed to clicking calculate and waiting, although the rgb combine tool  is very new to me I have found it a bit frustrating to use as I need to click calculate each change and find myself back at the beginning again.


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(@mabula-haverkamp-administrator)
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Posts: 1632
June 9, 2018 21:54  
Posted by: Tony
Posted by: Mabula Haverkamp - Admin

Dear Tony @tonymacc,

Think about it, if you only assing the 2 channels to G and B, then the Red channel in the composite is 0 everywhere. You will need to assing it to the red channel as well to be able to get a normal grey sky background.

So perhaps you should try this, start RGB combine tool and:

  1. assign Ha to green
  2. assign 03 to blue

just like you did, and then

3. mix the Ha data in the red channel as well, by applying Ha to red as well for 100%. That should give you an initial starting point with a grey sky background.

Let me know if this helps and clarifies the green/blue result that you showed.

Kind regards,

Mabula

Hi @Mabula, ah yes, sorted now. This now creates another question, is there a way that we can see the colours change as you move the sliders? as opposed to clicking calculate and waiting, although the rgb combine tool  is very new to me I have found it a bit frustrating to use as I need to click calculate each change and find myself back at the beginning again.

@tonymacc, excellent.

Yes, in the future this will become possible. I am working on screen output using the graphics card for drawing and calculation and that should facilitate it 😉

APP 1.062 probably will have GPU drawing enabled as a first step. The next step will be to implement the calculations on the GPU as well.

Mabula

Main developer of Astro Pixel Processor and owner of Aries Productions


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