Author Topic: SMC NGC 292  (Read 9591 times)

Offline Alejandro Tombolini

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SMC NGC 292
« on: 2013 February 14 00:57:30 »
Continuing with the pictures from La Hacienda Los Andes in Chile
in our the last trip

NGC 292 description of processing

Camera: Canon 5DIII - Filtro Type I

Telescope: Takahashi FSQ-106EDX - Focal Lengh 530 mm -  f/5

Images: 41 x 5 minutos, 10 x 1 minuto, 10 x 15 segundos, 10 x 5 segundos. ISO 1600

Total time: 3 horas y 37 minutos

Credits: José Joaquín Pérez, Ezequiel Bellocchio, Daniel Verschatse, Adriana Fernández, Sergio De la Fuente e hijo, Leonardo Julio, Carlos Milovic y Alejandro Tombolini.

Program: PixInsight

The picture is going to be and HDRComposition of four images (300 seconds, 60 seconds, 15 seconds and 5 seconds). The choise of doing a HDR is due to de cluster, which lost information in the core in long exposure pictures, then HDRComposition tool will  replace that information, using the data from the lower exposure pictures.

Having lights, flats, darks and bias for each of the series, first I open Blink and select lights to detect posibles imperfect images to be eliminated (moved or out of focus).



At the same time I choose the best image to be use as reference image for alignment and integration. It also can be determinated with SubframeSelector Script.
The best one is image 28



In BatchPreprocessingScript Add Bias, Darks, Flats and Lights for each one of the series and will obtain four integrations



Now I use StarAlignment tool to register the four frames



and now it is necesary adjust the images before to HDR Composition. First a crop of the images:



Canon banding will be eliminated with CBR in horizontal and rotating the image 90° to apply also in vertical. After that, DBE. Both process to each one of the images.
Visualized with STF looks similar, even with different exposure time, because the stretching is also different in each image.



Finally HDRCompositon tool. The idea is to replace the pixels of the cluster:



Then,  I define a preview in the cluster and indicate it in HDRCompositon tool as area of interest



As result we obtain three masks and the image HDR. Comparing with the five minute integration can be seen how was recovered the information in the core of the cluster



Define a preview of the background to be used as Reference Image in BackgroundNeutralization Tool



After that, ColorCalibration using the same preview as Reference image in Background Reference and the HDR image as Reference image in White Reference



DynamicPSF to generate the PSF to be use in Deconvolution tool



First try with Deconvelution in a preview. Can be seen as some bright stars are affected in the core, then generate a star mask with StarMask tool with values by default to protect those stars



Protecting stars apply Deconvolution. See changes in the core of the cluster



First Masket Stretch with 100 iteration y TargetMedian 0,2. I have performed Masked Stretch in a clone of the image that late will delete to avoid that PI remember all the iterations when saving the project.



After Masked Stretch, apply HDRMT with the object of improve details in stars in the core of de cluster



Second Masked Stretch, but now TargetMedian 0,4



HT to clip shadow a little.



Extract  luminance from the image and apply HT for stretch and ATrousWaveletTransform to smooth a little. This mask is going to be used with CurvesTransformation



First protecting background with Lmask to increase saturation an color in the galaxy



And then inverting the Lmask to protect the galaxy an decrease "c"



SCNR to remove the green



There are areas that I want to highlight, mainly the faint nebulaes between the stars. For that I will work increasing saturation in those nebulaes.



Remove stars: First, clone the image and clone the clone. Apply to HDR_clone_clone to obtain the image with stars and some nebulae's structures.



Substract HDR_clone - HDR_clone_clone (the image that only have stars)



Make a clone of the image without stars and smooth it using ATWT in differents layer, decreasing or increasing the relative weight of wavelet in layers of different sizes



Now apply ATWT again in layers from 32, 64 and 128 pixels having as target the RGB channels to increase the contraste of that regions and protecting background with Lmask



Saturation of the nebulaes protecting background with Lmask



With PixelMath add the image without stars and its clone with nebulaes highlighted.



Come back to the image that only have stars and saturate



Next step is to recover the image, adding the stars and the nubulae with PixelMath, applying over the original image and protecting the background with Lmask.



HistogramTransformation transfering the STF on the base of HT Tool and apply protecting background with Lmask.



Too much work in saturation generate some issues in stars that will be corrected with ACDNR applied to chrominance



As I do not want to eliminate completely the green in the galaxy, I will apply SCNR with a mask made with G channel. Extract G and increase contrast with LHE and Curves. After that apply SCNR protecting the galaxy.




UnsharpMask to increase details, protecting the background with Lmask. (I like the definition in the center of the cluster and what can be achieved with HDRComposition)



Last color touch protecting background with Lmask



Resample for web publication



Addition of the name



Final Image:



Full resolution for download

Edit: Verylargeimage warning 17 MB

 


« Last Edit: 2013 February 26 04:33:49 by Alejandro Tombolini »

Offline Lex

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Re: SMC NGC 292
« Reply #1 on: 2013 February 14 20:14:02 »
Alejandro,

what should I say; by watching your picture I feel like some bloody rookie again!
Your processing skills are simply huge just as your fantastic results  8)
Really a state of the art master piece!!

You have my biggest respect!

Thanks for sharing your techniques; keep them coming!

Best
Clear Skies!!

Lex

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Offline cs_pixinsight

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Re: SMC NGC 292
« Reply #2 on: 2013 February 14 20:32:32 »
Alejandro, I couldn't agree with Lex more.  I never miss a single one of your posts because these tutorials are fantastic step-by-step masterpieces.  You should be on the payroll  ;)

Craig

Offline Raymond

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Re: SMC NGC 292
« Reply #3 on: 2013 February 14 22:11:48 »
Hi Alejandro
Thanks - once again :) :) :) - for this complete and excellent tutorial!!
Raymond
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Offline Alejandro Tombolini

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Re: SMC NGC 292
« Reply #4 on: 2013 February 15 02:01:28 »
Hi,
Thank you very much for your comments!, good to know that the detailed process is useful. :) :) :)

I am learning PI and trying to understand as much as possible how to use each tool and how to achieve a correct process. Please feel free of tell every thing you think can be improved/ modified / do in a better way etc. as it will be very useful for all of us.
Saludos.


Offline AstroScience

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Re: SMC NGC 292
« Reply #5 on: 2013 February 15 14:14:18 »
Alejandro,
detailed process is more than a "useful", it's a compelling way of study for complex things, a specially for newcomers!
Thank you for your hard work and time invested in this!

Offline DMouse

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Re: SMC NGC 292
« Reply #6 on: 2013 February 15 15:29:46 »
Wow! Great image and thanks for the workflow/tutorial. Makes me realise that there is a lot more I can do with PI.

Clear Skies

Paul

Offline kwalker

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Re: SMC NGC 292
« Reply #7 on: 2013 February 16 04:50:50 »
Very intense wonderful image
Thank you for taking the time to show us you’re step by step processing.

Offline chris_todd

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Re: SMC NGC 292
« Reply #8 on: 2013 February 16 19:27:59 »
What a fantastic tutorial on how to process a great image!  And it's very timely for me, as I used a modified 5D MkII with a 200mm lens to shoot M42/43 and the belt of Orion at the Winter Star Party, and obtained 300s, 60s, 15s, and 2s images hoping to try the HDR composition tool, and here you have published a nearly perfect tutorial for me.  Thank you!

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Offline Alejandro Tombolini

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Re: SMC NGC 292
« Reply #9 on: 2013 February 26 04:34:12 »
Hi, added new link to large image in the first post.

Saludos. Alejandro.

Offline Geoff

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Re: SMC NGC 292
« Reply #10 on: 2013 February 26 07:15:32 »
Hi, added new link to large image in the first post.

Saludos. Alejandro.

The detail in the large image is amazing once you zoom into it. Great image.  I'm not sure about the colour balance though.  47Tuc looks far too yellow.
Geoff
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Offline Alejandro Tombolini

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Re: SMC NGC 292
« Reply #11 on: 2013 February 26 11:12:29 »
Hi Geoff, you are right, and you are not the first one that mention it. I am working on it, reprocessing the cluster and let you know the result. I will try to finish it today.
BTW, it is not 47 Tuc, it is NGC 362
Saludos,
Alejandro.

Offline Geoff

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Re: SMC NGC 292
« Reply #12 on: 2013 February 26 21:54:18 »
BTW, it is not 47 Tuc, it is NGC 362
Saludos,
Alejandro.
Ah yes, the "forgotten" cluster. Always ignored because of it's proximity to 47 Tuc.
Geoff
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Offline Alejandro Tombolini

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Re: SMC NGC 292
« Reply #13 on: 2013 February 28 02:21:01 »
Following with this, it was noted, and I agree, that the cluster NGC362 was too yellow..., that means that there is not blue stars,..., mmmh? ???

Then I tried again analizing the cluster more in details, due that I suspect that it was by excesive saturation in my previous processing. (I would appreciate comments about this)

Crop the image, to re-process only the cluster. I am going to saturate less than before, trying to resolve the stars in the core and see if the blue ones appears .

The first part until the determination of de PSF is de same I did in the previuos process of SMC



Apply FastRotation and create an star mask to be use with Deconvolution for protection of stars cores of the bright stars



Deconvolution, choosing the external PSF an setting global dark in deringing until there is not black rings.



Stars can be sharpened a little more, mainly those stars that usually remain in cluster as a circle shadow, without enough bright. For that I did another deconvolution and here I have many questions.
What happens with the image after deconvolution, is still linear? Can I deconvolve the image twice?..., well, I did
This time select another algorithm that sharpen a lot more, Regularized Van Cittert and play with Global dark and Global bright deringing until find the correct values



First MaskedStreth



HDRWaveletTransformation for dynamic range compression



Second MaskedStreth



HT for clipping shadows



Extract L and build a mask. Apply HT and ATWT for intensification and smoothness respectively



Curves - Saturation protecting background with L mask



Curves - Desaturation of the background protecting stars with L mask



HDRWaveletTransformation for dynamic range compression and achieve details in the core (Without masks)



Chrominance noise reduction with ATrousWaveletTransform in layers of 1, 2 and 4 pixels



Reduce green using SCNR tool, and for the first time I can see some little blue stars



Generate a starmask that let see big stars outside the cluster to correct some "imperfections"



Sorry but I am tempted to saturate a little more the stars.
For that, I generate a detailed mask that allow to see the faintest stars in the cluster using StarMask and ATrousWaveletTransform to smooth a little the layer of one pixel



Curves for color and saturation, but do not help too much with blue stars



Apply UnSharpMask with the previous mask protecting background



This background problems should not appear, but if they do, now we have the formula that Gerald has teached 



Finally HT to clip shadows and stretch, protecting background with the previous Lmask.



Final Image


Online FunTomas

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Re: SMC NGC 292
« Reply #14 on: 2013 February 28 07:11:56 »
Alejandro. This is really amazing result. This last image looks absolutely natural. Excellent.