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[Solved] Using the Hubble pallette and the HSL tool

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(@msamazing)
Main Sequence Star Customer
Joined: 8 months ago
Posts: 38
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I imaged during the moon phase using just narrowband filters.  When I imported my light frames, I imported Sulphur to the Red channel, Hydrogen to Green, and Oxygen to Blue.
 
I push integration as I did not use an calibration frames and now have a black and white object and went to tools and then Combine RGB.
 
Should I stay with Multiply-scale and LRGB-1 defaults or something else here like the SHO(Hubble)1 or 2?  Also, was I correct to import to those color channels or should I have imported to the actual filters I used under lights and then Combine RGB would have figured out the colors?
 

 


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(@wvreeven)
Galaxy Admin
Joined: 4 years ago
Posts: 1647
 

@msamazing When integrating the lights you should not assign them to any filter at all. APP should be able to recognize the filter from the FITS headers of the images and will assign Ha, OIII or SII to them. When done integrating you can choose SHO (Hubble) 1 or 2 to create an RGB image.


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(@msamazing)
Main Sequence Star Customer
Joined: 8 months ago
Posts: 38
Topic starter  

@wvreeven Thank you very much!  I assigned them to the color channels thinking that was what I was supposed to do.  I will start over and try again.  I really appreciate your help!


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(@msamazing)
Main Sequence Star Customer
Joined: 8 months ago
Posts: 38
Topic starter  

@wvreeven- problem #2.  I ran the Hubble option and the colors are wrong.  It came out green.  What did I do wrong here?  I just took a photo of my screen to show you.

2D89319A 3DE2 47D8 92CE 40BCE0DAE8C3

 


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(@wvreeven)
Galaxy Admin
Joined: 4 years ago
Posts: 1647
 

@msamazing You did nothing wrong. The Hubble palette assigns Ha to green and between Ha, OIII and SII, Ha is the strongest. So this is perfectly normal. Next you need to tweak the colors so it shows more the golden orange of the Hubble palette that we all love so much.

How do the colors look when you use SHO (Hubble) 2?


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(@msamazing)
Main Sequence Star Customer
Joined: 8 months ago
Posts: 38
Topic starter  

@wvreeven - LOL.  Do you know if there is a tutorial on where I go from here?  I am not sure how to do that.  Is it something I can do in APP or do I need to go to a different app like Photoshop?  Is there something that you know which can help me with this?


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(@wvreeven)
Galaxy Admin
Joined: 4 years ago
Posts: 1647
 

@msamazing It is possible to do with APP via HSL Selective Color in the Tools tab. Unfortunately there is no tutorial for that yet. I'll ask Mabula if he can give some pointers. You could export the image to TIFF in APP and then load it in an external tool to process it further there.


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(@mabula-admin)
Quasar Admin
Joined: 5 years ago
Posts: 3117
 

Hi Michael @msamazing,

Making a Hubble palette completely in APP is perfectly possible and easy these days. Soon I will make a video tutorial on how to do just that 🙂

But I will try to help you to get the most out of your narrowband data 😉

First, are you using APP 1.083 the new release? If not, please update, because it has much better tools for exactly this purpose.

If you load your lights to make the integration, you simply need to use the proper filter names. If you shoot with a H-alpha filter, you need to use that, like Wouter already explained.

Then when you have your 3 integrations, H-alpha, SII, OIII, you load them into the RGB Combine Tool, making sure that the integrations are correctly recognized as H-alpha, SII, OIII  and load them while setting the SHO1 or SHO2 formula. SHO means that SII is mapped to Red, H-a to Green and OIII to blue.

Normally, an initial SHO1 will look rather green with purple stars like this, so your result is not odd at all:

SHO1

Using SHO2, set the formula to SHO2 and click on new formula (this applies that formula) and then recalculate. SHO2 will already reduce the green cast and purple stars:

sho2
sho2 f

The formula shows that the channels are being mixed a bit, which has the effect that the green and magenta casts are reduced.

Now, per object and per dataset, there is no fixed formula that will always work because it all depends on the object and the quality of your data which formula will give you the most pleasing result. So you need to tweak the formula to get even nicer results, I made a custom formula on this by mixing the channels a bit differently when compared to SHO2 formula:

shoc formula

Notice that I also increased the multipliers for SII and O3, that really helps, because otherwise the strong H-alpha signal overpowers SII and O3. This now already looks like a good Hubble palette, right?

Next you can play with the formula even more... realise that H-alpha has the best signal and contrast. Why not use that to make up most of the Luminance of the composite?

shocL formula

I set the L slider for H-alpha to 75%, so that means that the H-alpha signal contributes 75% for the luminance of the composite. That reduced noise and increases contrast, because H-alpha has better contrast and less noise when compared to OIII and SII.

Further tweaks can be done with HSL Selective Color, leading to

shocL RY BCy Ry final

this for example. The HSL Selective Color tool enable you to tweak all colors in the image to your liking and you can tweak low lights or only the bright stars.

I think for now, let's us try to first get the Composite result much better with the RGB Combine Tool using my formula examples as shown above 😉 Then afterwards I can help you with the HSL Selective Color tool.

Mabula

This post was modified 4 months ago by Mabula-Admin

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(@mabula-admin)
Quasar Admin
Joined: 5 years ago
Posts: 3117
 

Hi Michael @msamazing,

Can you please upload your data here:

https://upload.astropixelprocessor.com/

use username and password: upload

And let me know once uploaded 😉 I will check it as soon as possible.

(I can not open your dropbox link since dropbox is forcing me to register with them, which I don't want to do.)


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(@msamazing)
Main Sequence Star Customer
Joined: 8 months ago
Posts: 38
Topic starter  

@mabula-admin - this doesn't work.  It doesn't recognize my sign in and it won't allow me to change the password or set it up.  


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(@wvreeven)
Galaxy Admin
Joined: 4 years ago
Posts: 1647
 

@msamazing As Mabula wrote, you need to use upload both for username and password. Your APP credentials won't work. 


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(@msamazing)
Main Sequence Star Customer
Joined: 8 months ago
Posts: 38
Topic starter  

@wvreeven got it now.  Thank you.  I thought he meant that there was a different password and user name for when you upload.


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(@msamazing)
Main Sequence Star Customer
Joined: 8 months ago
Posts: 38
Topic starter  

I am not sure if I did it correctly .  Here is a screen shot of my 3 uploaded files.

upload app

 


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(@mabula-admin)
Quasar Admin
Joined: 5 years ago
Posts: 3117
 

Hi Michael @msamazing,

Thanks, the upload was fine 😉 I will be looking at it right now, will report back soon with my findings.

 


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(@mabula-admin)
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Joined: 5 years ago
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Posted by: @msamazing

@wvreeven- problem #2.  I ran the Hubble option and the colors are wrong.  It came out green.  What did I do wrong here?  I just took a photo of my screen to show you.

2D89319A 3DE2 47D8 92CE 40BCE0DAE8C3

 

Hi Michael,

So this is not wrong but perfecly normal with the most simple Hubble palette SHO1 formula. I get exactly the same and your individual SII, H-alpha and OIII look really good.

SHO1 Hubble Palette

Now, as explained earlier:

Using SHO2, set the formula to SHO2 and click on new formula (this applies that formula) and then recalculate. SHO2 will already reduce the green cast and purple stars:

SHO2 Hubble Palette

This immediately looks a lot better 🙂

Now as in my example, I customized the SHO2 formula by mixing a bit more of Ha, SII & OIII to the RGB channels of the composite and by raising the multipliers of both SII and OIII, formula can be seen in this screenshot:

SHO custom Hubble Palette

Again looks better ! Green cast is gone and less purple stars, nice blue and red Nebula... and brownish dust. You have very nice data here !

Next step is technically more advanced, but it involves playing with the Luminance of the composite. The H-alpha integration is perfect for this, since that one shows the brown dust surrounding the bright nebula, so I set the L slider of H-alpha to make up 75% of the composite. If you would set it to 100% you might get star border artefacts, so best not to do that and 75% looks really awesome !

SHO custom luminanceFromHalpha Hubble Palette

In the next post, I will demonstrate futher tweaks with HSL Selective Color 😉


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(@mabula-admin)
Quasar Admin
Joined: 5 years ago
Posts: 3117
 

Now to continue, load this result into the HSL Selective Color tool.

First I am going to alter the blue and cyan nebula parts:

I select BLUE and for the data range of the blue pixels the preset of

background + 2*noise - 25% range

looks great to alter the blue nebula, because this is the mask that is shown with show color selection:

HSL Selective Color Blue Nebula Mask

I make the nebula more blue (less cyan) by setting the B<-->YE slider to -0,80

HSL Selective Color Blue Nebula More Blue

I keep this change now by clicking on keep current adjustments. This resets all sliders and manipulations for further tweaks on this result.

Now we go to the red pixels, select RED and try to get a nice mask to influence the brown dust and red nebula parts, background - 25% range is good:

HSL Selective Color Red Nebula Mask

I make them more Red by setting R<-->CY to -0,80 and I injected some yellow to get more colors in there...

HSL Selective Color Red Nebula MoreRedandYellow

Again I keep this by clicking on keep current adjustments.

There is a slight hint of green in some nebula parts which you can see by stretching very weak:

HSL Selective Color Green

which you can now counter with selecting green and a proper range mask:

HSL Selective Color Green Mask

And then adding red and blue and desaturating a bit

HSL Selective Color Green Mask less Green

Again kept it with keep current adjustments... I did some more minor tweaks and then this is great I think:

HSL Selective Color finished

Final Step as a bonus, I started the Remove Ligth Pollution Tool on this result:

Make sure that you can see all sky background details by over-stretching and over-saturating so we can clearly see what we want to correct 🙂

RemoveLightPollutionTool

I save this and then make a final stretch with the preview filter on the right-side:

FinalStretch

This is the saved stretched JPG and it's inverse :

M42 SHO Hubble 2 SC lpc cbg St
M42 SHO Hubble 2 SC lpc cbg St invert

Hope this all helps to get a similar result 😉


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(@mabula-admin)
Quasar Admin
Joined: 5 years ago
Posts: 3117
 

Hi Michael @msamazing, so to summarize, from SHO1, to SHO custom with Luminance, to HSL Selective Color, to final stretch:

SHO1 Hubble Palette
SHO custom luminanceFromHalpha Hubble Palette
HSL Selective Color finished
FinalStretch

 

Really nice data to work with 😉 looks great !


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(@mabula-admin)
Quasar Admin
Joined: 5 years ago
Posts: 3117
 

Oh, and a tried a star reduced version as well:

M42 SHO Hubble 2 SC lpc cbg St reduced

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(@msamazing)
Main Sequence Star Customer
Joined: 8 months ago
Posts: 38
Topic starter  

@mabula-admin Thank you so much for this.  One issue is that after adjusting the luminance to 75, my image looks a lot different than yours.  Please see the attachment.  It got blown out and is very white.  It seems both of our settings are the same.  What did I do wrong?

APP

 


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(@mabula-admin)
Quasar Admin
Joined: 5 years ago
Posts: 3117
 

Hi @msamazing,

Please check on the right side, you have not yet enable color saturation in the preview filter 😉 Enable saturation with the checkbox and play with the SAT and SAT TH sliders. Then you will see the same as me 😉

Mabula


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