Author Topic: Milky way - One Shot Image - Take II  (Read 3358 times)

Offline Alejandro Tombolini

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Milky way - One Shot Image - Take II
« on: 2013 April 23 02:27:27 »
From one of the best skyes of Argentina, in San Rafael, province of Mendoza.

I was in a star party and only had with me the camera and a little tripode, then, I tried a cuople of image.
This is a single image unguied, and ofcourse the stars are lines, but when resampled is almost imperseptible.
Canon 5DIII - ISO 12800 - Exposure: 30 seconds - F/D 6,44 - Focal Length 24 mm

As I do not have masters for this ISO, I integrated 50 bias of ISO 6400 to generate the MaserBias and use a single 20 minutes darks to calibrate as I have a line that need to be corrected with a dark.



Debayer of te calibrated image and correct some Cold and Hot pixels




There were needed two DBE to correct the gradients. (I do not use flats for calibration)




Generate a preview representative of the background to be used as Reference Image in Background Neutralization Tool



Generate a preview of the main part of the galaxy to be used as Reference Image for White Reference in Color Calibration and the same preview as before to be used as Reference Image for Background Reference



Now the key cuestion here is generate a mask that allow to process the sky without afecting the mountains and viceversa.
For that I clone the image and apply consecutivelly Morfological transformations and smoothnees with ATWT until have a good diferenciation between sky and mountains that allow range mask to generate what I am looking for.









Now I will work protecting the mountains. First apply the formula to elimiante darks holes.



Transfer STF to the HT tool and apply



Noise reducction: to green



Chrominance noise reduction in big scales



Saturation with CurvesTransformation



Noise reduction in one pixel layer using MultiscaleMedianTransform tool



Chrominance nose reduction in  layers from two to eight pixels



A little more contrast with ATWT



Curves to correct colors (a and b)



Exponential transformation to smoothnees the background



Now I need a more located chrominance noise reduction, for that I will generate a mask that protect at the same time the mountains and the brigh part of the sky.

Extract Luminance, invert and apply curves and ATWT to smoth a little



Then, with PixelMath add the luminance and the previous RangeMask



Now apply chrominance noise reduction in the background



Protecting now the sky with the first range mask, apply HT to the mountains (Transfer the STF to the HT tool)



Reduce red in the sky protecting the mountains.

Noise reduction to smooth the background using ACDNR



Rotate 90° Counter-Clockwise and resample



Add signature



Final image:



Saludos, Alejandro.

Offline Jules

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Re: Milky way - One Shot Image - Take II
« Reply #1 on: 2013 April 23 10:39:03 »
Thats a gorgeous image Alejandro.

I have been thinking for a while to get a SLR for this sort of imagery. Its spectacular stuff.

Regards

Julian

Offline chris_todd

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Re: Milky way - One Shot Image - Take II
« Reply #2 on: 2013 April 23 16:13:26 »
An awesome image and excellent tutorial!  Thanks again, Alejandro!
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Offline cs_pixinsight

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Re: Milky way - One Shot Image - Take II
« Reply #3 on: 2013 April 23 21:28:29 »
Alejandro, I'm fond of this type of astrophotography (the reason I started AP) and this really reinforces that.  I use an Astrotrac with my DSLR and have just started putting together a 10 image mosaic of the Milky Way.  This tutorial will be a terrific asset in processing those images and serve as further inspiration in what can be achieved.

Craig

Offline Alejandro Tombolini

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Re: Milky way - One Shot Image - Take II
« Reply #4 on: 2013 April 24 01:08:40 »
Thank you all for the comments! Good to know that it can be helpful.

Craig, that mosaic sounds promising!

Saludos. Alejandro.

Offline talbotj

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Re: Milky way - One Shot Image - Take II
« Reply #5 on: 2013 April 28 23:56:38 »
Alejandro,

Excellent tutorial.  Thank you.

Jon Talbot
Jon

Offline Alejandro Tombolini

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Re: Milky way - One Shot Image - Take II
« Reply #6 on: 2013 April 29 11:35:09 »
Thank you Jon!!!
Saludos, Alejandro

Offline Tel Lekatsas

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Re: Milky way - One Shot Image - Take II
« Reply #7 on: 2013 April 29 13:40:41 »
Hi Alejandro,

Glorious image and extremely helpful tutorial. Amazing what you can do with one unguided shot.

Tel

Offline boris sputnik

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Re: Milky way - One Shot Image - Take II
« Reply #8 on: 2013 May 22 00:09:01 »
Absolutely Awesome !!!  Congratulations !
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Offline Rowland

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Re: Milky way - One Shot Image - Take II
« Reply #9 on: 2013 May 27 09:46:46 »
Alejandro. What an absolute delight. I want to follow this through with one of my own images, step by step. Thank you for sharing this.

Offline jeffweiss9

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Re: Milky way - One Shot Image - Take II
« Reply #10 on: 2014 March 12 03:19:22 »
Alejandro-
Beautiful Milky Way shot and great tutorial.
Thinking of trying some shots in this direction.
Thanks,
-Jeff
APM LZOS 130/780 f/6 LW CNC II APO, EM-200 Temma2, FLI Microline ML-8300, Astrodon E Gen 2 filters and 5nm Ha