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[Sticky] RGB Combine tool: a LHaRGB example using H-alpha as both Luminance and Red.  

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(@singding)
Red Giant Customer
Joined: 2 years ago
Posts: 66
01/03/2018 3:28 pm  

hi!

 I am on the fence about purchasing this software, I think it has amazing potential,.i love the stacking process and light pollution removal, bug I am having trouble getting good colors again. I understand you all are busy and have your own lives but....if someone had time, would you mine looking at my data?  🙂

its HaRGB 

thanks!

ha    https://drive.google.com/open?id=1CrLh0YgUmY8NVPmzdjs7oLcGS7WNPwxW

red    https://drive.google.com/open?id=1uqvjz0g1tL_IRQJ2mJf5wSy4Vb6FrxaT

green     https://drive.google.com/open?id=1YGioAt8MMJX-YDtBMBiEnjw0fSJ9G2Nc

blue      https://drive.google.com/open?id=12UgoginwSWGYdIMIaw-IncVgGsQabCvH

 

I simply want to know bow to achieve good colors...that's the hardest part of processing for me.

 

Adam

 

Edit by Mabula: I have upgraded Adam's post to a sticky 😉

This topic was modified 6 months ago by Mabula Haverkamp - Admin

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(@singding)
Red Giant Customer
Joined: 2 years ago
Posts: 66
01/03/2018 6:17 pm  

I am attempting to process this now also..when I load hargb ( I put ha as Luminance) which slider do I adjust if any...for example if I want to weight the rgbif the exposure times are different...for exapexa..if I have 1 hour red, 1 hour green, then 1.5 hours blue (and say 5hours Ha). What slider do I move and how does that work?)

 

Then, do I save the image and load into a different step? Is there a workflow for post processing of lrgb or HaRGB? I don't know if I should be doing a synthetic luminance or not and if so, how do I do that? Do you make synthetic chrominance also?

 

Sorry for so many questions....:)

 

Adam


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(@singding)
Red Giant Customer
Joined: 2 years ago
Posts: 66
07/03/2018 5:48 pm  

HI Mabula,

 

So I was able to do HaRGB combine, and added HA for luminance and added another HA into red also.   I was able to get decent colors with RGB combine, then I did light pollution removal, then background calibration, the I went into star colors and my image turned blue....* the nebula turned blue after it was a nice pretty red.  Any idea why?  I am not sure why that happened so I cancelled out of the star color calibration and just did not know what I was doing wrong. Any help is appreciated!    I

FB IMG 1520174641396
FB IMG 1520174633470

    these images are without accepting the star color calibration. one of the images  I took into StarTools for final noise reduction

 

Adam


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(@mabula-admin)
Quasar Admin
Joined: 2 years ago
Posts: 2113
16/03/2018 11:05 pm  
Posted by: singding

hi!

 I am on the fence about purchasing this software, I think it has amazing potential,.i love the stacking process and light pollution removal, bug I am having trouble getting good colors again. I understand you all are busy and have your own lives but....if someone had time, would you mine looking at my data?  🙂

its HaRGB 

thanks!

ha    https://drive.google.com/open?id=1CrLh0YgUmY8NVPmzdjs7oLcGS7WNPwxW

red    https://drive.google.com/open?id=1uqvjz0g1tL_IRQJ2mJf5wSy4Vb6FrxaT

green     https://drive.google.com/open?id=1YGioAt8MMJX-YDtBMBiEnjw0fSJ9G2Nc

blue      https://drive.google.com/open?id=12UgoginwSWGYdIMIaw-IncVgGsQabCvH

 

I simply want to know bow to achieve good colors...that's the hardest part of processing for me.

 

Adam

@singding,

I will give it a try tomorrow 😉 and post my results.

Mabula

Main developer of Astro Pixel Processor and owner of Aries Productions


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(@mabula-admin)
Quasar Admin
Joined: 2 years ago
Posts: 2113
16/03/2018 11:09 pm  
Posted by: singding

HI Mabula,

 

So I was able to do HaRGB combine, and added HA for luminance and added another HA into red also.   I was able to get decent colors with RGB combine, then I did light pollution removal, then background calibration, the I went into star colors and my image turned blue....* the nebula turned blue after it was a nice pretty red.  Any idea why?  I am not sure why that happened so I cancelled out of the star color calibration and just did not know what I was doing wrong. Any help is appreciated!    I

FB IMG 1520174641396
FB IMG 1520174633470

    these images are without accepting the star color calibration. one of the images  I took into StarTools for final noise reduction

 

Adam

Hi Adam, @singding,

These look great already 😉

The star color calibration in APP 1.058 was a bit of on the initial model calculation, it could very well explain the total blue result. (Have seen it on some images as well). So in APP 1.059 some adjustments in the model calculation were made, so that should definitely work better.

But, I will process your frames tomorrow and show the result 😉

Mabula

Main developer of Astro Pixel Processor and owner of Aries Productions


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(@mabula-admin)
Quasar Admin
Joined: 2 years ago
Posts: 2113
17/03/2018 8:34 pm  

Hi Adam @singding,

Okay, I have downloaded your data and did a processing using APP's tools.

Before I show the steps, I will point out that the data is very nice, especially the H-alpha data looks very good 😉

If you would use Multi-Band Blending (6) MBB in integration) in the creation of the individual layers in combination with Local Normalization Correction, you will probably have a bigger field of view to show in the final image as well, so I think it's worth reintegrating all panels with MBB and LNC.

And the final result will depend a lot on background correction using the Remove Light Pollution tool.

(I think that if i would redo every step, that the result will be better because I now know better where nebulosity is and where not. )

 

Step 1) I load the R,G, B & Ha channels into the RGB combine tool to have a look at how the data looks. I assing Red to Red, Green to Green, Blue to Blue, H-alpha to H-alpha when the tool starts.

R,G,B will have a multiplier of 1.0 to start with. H-alpha is not enabled, since multiplier is 0.0.

step 1 default RGB Combine

 

Step 2) I did a small multiplier adjustment to correct Red and Blue, because green is a bit stronger. Blue x 1.5 and Red 1.75. Also enable saturation strongly to have a better look at the data:

step 2 small adjustment Red and  Blue

 

Step 3) It's quite clear that there are huge gradients due to light pollution that we need to correct.

Doing this carefully before making the composite, will really help 😉 so I first corrected the R,G,B & H-alpha layers individually in the Remove Light Pollution tool:

step 3 correct gradients first

 

Step 4) After correction, we load the corrected 4 channels into the RGB-combine tool, again only looking initially at R,G,B channels and an adjustment for Red and Blue:

step 4 LPC RGB Combine only  RGB

 

Step 5) add H-alpha to the red channel, assign H-alpha for 100% to Red in the composite. Since the Red channel is added as well, both contribute for 50% in the composite:

step 5 add H alpha 100percent

 

Step 6) in the previous image the color of the nebula is very Red. If you adjust the H-alpha channel's Green and Blue contribution to the composite, you can give it a slightly different color and reduce the Red somewhat. I added the H-alpha layer for 25% to both green and blue in the composite. Now the nebula has a nicer color I think:

step 6 mix H alpha in other channels

 

Step 7) this step is optional, since the H-alpha channel is of good quality, I will use it partly as the luminance in the composite, I assigned it for 50% to the composite's luminance. This means that the other 50% luminance values come from the HaRGB data that you see at step 6). The effect of this is that the H-alpha's luminance will be more prominent in your compositie. I also adjusted the Red and Blue multipliers a bit to keep the star colors a bit more balanced.(reduced blue multiplier in this case):

step 7 add H alpha to luminance

 

Step 8) this is already looking pretty nice, I saved step 7 in the RGB Combine tool. I did a crop with the Batch modify tool. Then I did the Remove Light Pollution Tool on the compositie and started the Star Color Calibration tool:

step 8 Star Color Calibration

 

Step 9) as this point I realized, that the gradient/light pollution is not entirely correct. So I ran the Remove Light Pollution tool again, to reduce a gradient on the Top-Right side of the Nebula. Normally, I would now return to step 1 and first correct all layers individually and redo all steps up until here:

step 9 another LPC

 

step 10) final step is tweaking the composition by another crop and playing with the preview filter's sliders. And then I created 2 different JPGs at 100% using the save button below the histogram for publication on the forum:

step 10 preview filter settings
Adam JellyfishNebula LHaRGB ver1
Adam JellyfishNebula LHaRGB ver2

 

And in 1 picture, Adam's results and mine:

Mabula and Adam

 

Final notes:

  • the steps can be done in arbitary order in the RGB combine tool. Each calculate applies the composite parameters on the originally loaded channels.
  • to achieve a better initial composite for the RGB channels, it can be usefull, to normalize the channels in 5), in addition to only registering them. That will make the channels more compatible if you load them into the RGB combine tool.
  • if you load the channels into the RGB combine tool, the channels will be automatically corrected for their background levels. But you can adjust this by using the BG sliders per channel in the RGB combine tool. In this example, these BG sliders weren't needed at all.
  • Using the Remove Light Pollution tool needs practise on the tool, but also on the data. If I see the pictures now, I think it needs redoing and that will surely correct the background to a higher degree. There is a too black area in this case to the right of the Nebula I think...

 

Adam, let me know if this helps and clarifies the composte tool.

Main developer of Astro Pixel Processor and owner of Aries Productions


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(@mabula-admin)
Quasar Admin
Joined: 2 years ago
Posts: 2113
17/03/2018 8:52 pm  

Hi Adam @singding,

I have renamed and moved this topic to the Tutorials and Workflows forum 😉

And it's a sticky now.

Mabula

Main developer of Astro Pixel Processor and owner of Aries Productions


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(@singding)
Red Giant Customer
Joined: 2 years ago
Posts: 66
17/03/2018 10:30 pm  
Wow. Thanks for all that work you put in! I so appreciate it.  I will try messing with some m81/m82 data now :)
Thanks again, this was super helpful!!!!

Adam

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(@mabula-admin)
Quasar Admin
Joined: 2 years ago
Posts: 2113
18/03/2018 10:44 am  

Hi Adam @singding,

You're most welcome 😉

Mabula

Main developer of Astro Pixel Processor and owner of Aries Productions


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(@jb-gayet)
White Dwarf Customer
Joined: 2 years ago
Posts: 12
21/03/2018 10:06 am  

Great tutorial 🙂 

 

And how would you treat the Halpha layer to get a "negative" contrast on it like on this kind of image ? :

NGC 7331

Best regards 

JB


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(@patrick)
White Dwarf Customer
Joined: 1 year ago
Posts: 14
29/01/2019 7:43 pm  

Hello,

A video tutoriel are diponible to merge or combine Ha RGB data for un final image composite ?

Thanks,

Patrick

Patrick Dubé


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(@kijja)
Red Giant Customer
Joined: 2 years ago
Posts: 67
31/01/2019 3:32 am  

Hi,

This is a great tutorial. It helps me fine-tune my RGB combine process a lot. Thank you everybody.

Cheers,

Kijja

 


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(@mabula-admin)
Quasar Admin
Joined: 2 years ago
Posts: 2113
05/02/2019 4:23 pm  

Hi @patrick,

I will try to make one soon, I have written it on my todo list 😉

If you want me to use your data for this, feel free to send me a dataset 😉

Cheers,

Mabula

Main developer of Astro Pixel Processor and owner of Aries Productions


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(@patrick)
White Dwarf Customer
Joined: 1 year ago
Posts: 14
15/02/2019 1:10 am  

Hi Mabula,

It's great it will be very appreciated, I will be able to use only APP to do all my process. 😀

It would be a great pleasure to provide you my data for this tutorial 

Best regards,

Patrick

Patrick Dubé


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(@mabula-admin)
Quasar Admin
Joined: 2 years ago
Posts: 2113
22/02/2019 12:47 pm  
Posted by: Patrick

Hi Mabula,

It's great it will be very appreciated, I will be able to use only APP to do all my process. 😀

It would be a great pleasure to provide you my data for this tutorial 

Best regards,

Patrick

Dear @patrick,

You're most welcome to send me a RGB, Ha dataset for a video tutorial 😉

Can you send it to support@astropixelprocesor.com  using wetransfer.com ?

Mabula

Main developer of Astro Pixel Processor and owner of Aries Productions


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(@patrick)
White Dwarf Customer
Joined: 1 year ago
Posts: 14
23/02/2019 4:48 pm  

Hi Mabula,

Yes i send you  via wetransfer.com

Very thanks,

Best Regards,

Patrick

Patrick Dubé


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(@mabula-admin)
Quasar Admin
Joined: 2 years ago
Posts: 2113
24/02/2019 7:10 pm  

Thank you Patrick 😉

Main developer of Astro Pixel Processor and owner of Aries Productions


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