fiddling with astro image data
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- Panoramic Lounger
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fiddling with astro image data
In anticipation of Monday, which is a Public Hol here in the UK, being wet and windy I've downloaded the astro image data from this challenge on The Skysearchers:
https://theskysearchers.com/viewtopic.php?f=107&t=17126
However with it being too cold to be out in the garden this afternoon, I've been poking at the data already. This is my first attempt at turning it into an image.
Ken
https://theskysearchers.com/viewtopic.php?f=107&t=17126
However with it being too cold to be out in the garden this afternoon, I've been poking at the data already. This is my first attempt at turning it into an image.
Ken
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Re: fiddling with astro image data
It could be better, the blue/green detail at about 2 o'clock is blown out. There's still plenty of rain forecast for Monday though so I ought to have time to fiddle some more.
You know what they say, nothing's right until version 3
Ken
You know what they say, nothing's right until version 3
Ken
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Re: fiddling with astro image data
That's brilliant Ken! You have the Bok's globules standing out really well. What software did you use to process the data? Did you map it to Sii-R, Ha=G, Oiii=B?
Regards
Graeme
Regards
Graeme
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Re: fiddling with astro image data
I converted the .fit files to TIFFs using the default settings in Fits Liberator. I then used an ancient version of Photoshop CS2 to get each image into a separate channel (because I've yet to figure out how to do that in Affinity Photo). Yes, the mapping was the 'Hubble palette', Sii-->red, Ha-->green and Oiii -->blue. I then opened the composite TIFF in Affinity Photo and started playing. One of the latest whizz bang feature of Photo v1.9 is a dedicated 'Astro remove background filter'. That was handy.
Version two is in the workshop already. This one involves moving away from the defaults in Fits Liberator and using an ArcSinh stretch. Using that seems to have retained the detail that's blown out in this first version.
I'll post again in due course.
Ken
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Re: fiddling with astro image data
I downloaded the 90 day trial of Affinity but haven't used it much, the remove background filter would be useful for removing gradients caused by light pollution. PixInsight is popular amongst astrophotographyists.
Looking forward to version two.
Regards
Graeme
Looking forward to version two.
Regards
Graeme
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Re: fiddling with astro image data
about 5 times the cost of Affinity Photo
There's not enough red in v2 but I have recovered the blown out bits this time.
Ken
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Re: fiddling with astro image data
Yes, there's more detail in the blue/green parts, but some of the red details are lost now. You win some, you lose some...
Best wishes,
Hans
Hans
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Re: fiddling with astro image data
That's toned down the saturated peaks nicely. The reduced red has flattened the image a bit overall. Some people map the Siii to blue as well as the Oii and the Ha to red to produce a dual narrow band image. It works because Siii is at the red end of the spectrum and Oii at the blue end.
So will you be posting your image on the Sky Searchers forum?
Regards
Graeme
So will you be posting your image on the Sky Searchers forum?
Regards
Graeme
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- 5StarLounger
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Re: fiddling with astro image data
Beautiful! Thanks for sharing.
When is the 3D image coming out?
When is the 3D image coming out?
PJ in (usually sunny) FL
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Re: fiddling with astro image data
Here's version 3. Not sure it's right though.
Ken
Ken
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Re: fiddling with astro image data
There is no right and wrong really. The Hubble palette produces a false colour image. Tri band narrow data sets are collected with a mono camera and allocated to any part of the visible spectrum to make different aspects of the image stand out. Ha and Siii are both at the red end of the spectrum and the Oii is at the blue end but very faint. A colour camera would record a dull red image.
It was locked because it's not the current processing challenge. But now it's unlocked, just for you!
Regards
Graeme
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