Mel 15

Questions and answers about processing in StarTools and how to accomplish certain tasks.

Mel 15

Postby torsinadoc » Mon Dec 08, 2014 8:59 pm

I tried to process the HaRGB. Not really sure I have it down. I followed the example from 2012. Would someone like to take a shot at it?

Ha 32x600
R 25x300
G 25x300
B 25x300

All Bin 1x1
https://drive.google.com/file/d/0B1w8Ns ... sp=sharing

https://drive.google.com/file/d/0B1w8Ns ... sp=sharing

https://drive.google.com/file/d/0B1w8Ns ... sp=sharing

https://drive.google.com/file/d/0B1w8Ns ... sp=sharing

QSI 582 -10C
ES 102 APO



My Ha processing
Image

My Combined HaRGB
Image
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Re: Mel 15

Postby admin » Mon Dec 08, 2014 11:31 pm

Nice!

There are a number of ways to incorporate the Ha data into your processing. Which is just as well, as much depends on the object (ex. galaxy with just a few HII areas/knots vs a Ha-rich nebula as is the case here).
Roughly which method did you use here?
Did you combine all into a synthetic luminance frame for maximum signal?
I'll have a play with the data (if the end result is anything to go by I should be in for a treat! :thumbsup:) - willl report back...
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Re: Mel 15

Postby torsinadoc » Tue Dec 09, 2014 12:43 am

I made a synthetic luminance. Where I had difficulty was the color module

I followed the workflow that you had listed form a few years ago
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Re: Mel 15

Postby admin » Tue Dec 09, 2014 1:04 am

Ok, had a look - fantastic deep data indeed!

Now, I'm going to assume you process your Ha + R + G + B = synthetic luminance from your R + G + B = color,

Process each as normal, trying to tease out the detail that you want from your luminance stack.
For the color stack, just process it lightly (since we'll be using the chroma info only) and just make sure noise is all but gone. As usual, take care your stars show a good temperature continuum.

Once you've processed both, here's a new (and effective way) of using the heightened detail in the processed Ha + R + G + B stack, while using the visually correct colors from the processed R + G + B stack;

  • Launch the Layer module.
  • Put the luminance stack in the background
  • Put the color stack in the foreground
  • Switch Layer mode to 'Color Extract Foreground'; in the composite window you'll now see the luminance independent (normalized) color ratios.
  • Click 'Copy' to copy the composite window's result to the buffer.
  • Now click 'Paste->Fg' to paste the buffer as the new foreground.
  • Switch Layer mode to either Multiply (which does not take into account psychovisual color 'correct' transformation) or 'Color of Foreground'
  • If the darker parts of the background are too colorful for you, you can use 'Brightness Mask mode' set to 'where composite is dark, use background', while using Brightness Mask Power to modulate the effect.
  • You can use Blend Amount to control color saturation.

Something like this;

Screenshot-Untitled Window.jpg
Screenshot-Untitled Window.jpg (157.99 KiB) Viewed 5685 times


Notice the good distribution of star temperatures (deep red->yellow->blue).

You should now have the best of both worlds; the detail of the Ha, and the colors of the visual spectrum;

This is an example of your data (I didn't push the detail - just a quick workflow to demonstrate the end result).
Melotte15green125_synlum_processed_cropped_final.jpg
Melotte15green125_synlum_processed_cropped_final.jpg (707.95 KiB) Viewed 5685 times


Hope this helps!
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Re: Mel 15

Postby torsinadoc » Tue Dec 09, 2014 11:36 am

thanks
Color was better!
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Re: Mel 15

Postby admin » Tue Dec 09, 2014 10:34 pm

torsinadoc wrote:thanks
Color was better!

No problem - looking forward to the final result.
Also, the upcoming 1.4 alpha (to be released before the end of the year) will have an improved noise reduction routine, which will help (especially with luminance data like yours) rescue more detail from the noise floor.

Clear skies!
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