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Please Help ... I'm completely lost with RGB combine and SHO Data for Hubble Palette 1


(@aaronr)
White Dwarf Customer
Joined: 2 years ago
Posts: 21
Topic starter  

Hi, I'd like to use APP for RGB-combining my SHO data to get a hubble palette image.

I'm able to do so using Gimp and RawTherapee but APP seems to be able to provide less noisy results ...

I'know basically how to use the tool but I get no useful result. Also the sliders do not make sense to me.

I'd like to know exactly what th x and bg sliders do and why I see blue color if I only have red and green component added.

I'm quite experienced with image processing but I do not understand at all what's going on.

Can s/o please help me !?

I uploaded the registered fits here: https://treasure.arcane-mirage.de/index.php/s/d7cMy5bea9QtyA8

Feel free to experiment. I'd like to know which slider values give a useful result.

Thank you in advance : )


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(@aaronr)
White Dwarf Customer
Joined: 2 years ago
Posts: 21
Topic starter  

Another question: needs it to be done with stretched fits or unstretched fits ?


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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4736
 

The combination and all processing is always done linearly, so unstretched (the preview you see is an auto-stretch, but not saved as such by APP). When combining narrowband data, you do need to make sure the different channels are properly aligned and registered to each other. You can then load them into RGBCombine and pick one of the presets or change it yourself, the presets should give a good starting point already usually.


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(@aaronr)
White Dwarf Customer
Joined: 2 years ago
Posts: 21
Topic starter  

Thank You,

understood this and already did it this way.

I just solved my issue by using a normalization method in the rgb combine window without multiply.

The normalizations "none", "add", and "add-scale" seem to work. The default "multiply-scale" or "mutiply" don't work for me.

 

Screenshot 2021 11 24 211318

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