Author Topic: Zenithal Color Moon  (Read 17272 times)

Offline astroedo

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Re: Cenital Color Moon
« Reply #15 on: 2013 August 19 09:53:04 »
Thank you, Edoardo.

Have you tried splitting the RGB channels and aligning them with the same procedure? I did this in this image, which I am afraid I forgot to mention. I use the G channel as reference.

best
Ignacio
Thank you for the precious hint, I will try for sure, but I suspect that the pinkish color comes from a readout problem of the camera because it is only  near the border (always the same border) of the image.

But you opened the path, I will try to follow you.  ;)


Offline Alejandro Tombolini

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Re: Zenithal Color Moon
« Reply #16 on: 2013 August 19 17:26:05 »
Congrats Ignacio, very nice result!

Saludos. Alejandro.

Offline Ignacio

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Re: Zenithal Color Moon
« Reply #17 on: 2013 August 20 05:46:39 »
Muchas gracias, Alejandro.

saludos
Ignacio

Offline cbobchin

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Re: Zenithal Color Moon
« Reply #18 on: 2013 August 20 16:48:21 »
Amazing image. I'm impressed that PI can do this. It gives me another reason to buy it.

Offline slang

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Re: Zenithal Color Moon
« Reply #19 on: 2013 August 21 02:12:46 »
Hi there,

Friday night I carried out this little experiment from home. I took 105 raw exposures of the moon going thru the meridian, close to the cenit, with my canon 1000D and a barlow fitted AP130GT (1,5 mts FL). I processed the set entirely in PI 1.8: data reduction, alignment, stacking, and post-processing, similar to what I do with deep space data, including color enhancement. I used star alignment with 8 wavelet layers for structure detection, hoping it would bring out bright features of the moon suitable for alignment, given that the moon drifted quite a bit during the short session. It worked like a charm on the first try. I selected default distortion corrections parameters too. After reviewing the aligned set with Blink, I only had to reject about 5 frames that missed the alignment. For sharpening, I used Wiener filtering.

I like the end result very much, particularly colors and texture in the Copernicus region.

Suggest the hires version to appreciate the details.

with data: http://www.pampaskies.com/gallery3/Moon/Luna_Cenital_Color

hi-res: http://www.pampaskies.com/gallery3/var/fulres/Luna_Cenital_Color_hires.JPG

cheers
Ignacio

Wow. That's pretty amazing.

I have tried similar things with terrible results with PI, even though the tutorial with the lunar deconvolution example is one of the reasons I purchased PI :-)

I'm very interested in details of your workflow, and also what do you mean by Wiener filtering - I haven't come across that before.

Do you have a more detailed description of your processing methods?

I want to go back and re-process some of my earlier work now...

Cheers -
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Mount: Orion Atlas 10 eq-g, GSO RC8, Astrophysics CCDT67
Guiding: ST80/QHY5L-II-M
Cam: Canon EOS 450D (IR Mod), QHY8L

Offline Ignacio

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Re: Zenithal Color Moon
« Reply #20 on: 2013 August 21 06:12:25 »

Wow. That's pretty amazing.

I have tried similar things with terrible results with PI, even though the tutorial with the lunar deconvolution example is one of the reasons I purchased PI :-)

I'm very interested in details of your workflow, and also what do you mean by Wiener filtering - I haven't come across that before.

Do you have a more detailed description of your processing methods?

I want to go back and re-process some of my earlier work now...

Cheers -

Thanks. As I said, the workflow is pretty straight forward:   
1. Data reduction (bias,darks,flats) of RAW subs
2. Debayering
3. Selection of a reference sub
4. StarAlignment, with distortion correction enabled, and 8 wavelet layers in star detection. You may want to reduce the Maximum Distortion parameter to increase the number of alignment points. Check alignment with Blink.
5. ImageIntegration, with Winsorized sigma clipping and a rather low sigma level (about 20% rejection).
6. Color calibration
7. Wiener filtering (inside ResaurationFilter). I used a small PSF, you will have to experiment.
8. HistogramTrasformation
9. LocalHistogramEqualization
10. Several cycles of color saturation and chrominance noise reduction.

best
Ignacio

Offline Ignacio

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Re: Zenithal Color Moon
« Reply #21 on: 2013 August 23 20:08:36 »
By reducing the Maximum Distortion in Star Detection to 0.1, all frames aligned perfectly, and now all of the limb looks very good. In the original process, the top part of the limb had some staircase pixelation problem, which now is resolved.

http://www.pampaskies.com/gallery3/var/fulres/Luna_Cenital_Color_hires.JPG

Ignacio 

Offline Philippe B.

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Re: Zenithal Color Moon
« Reply #22 on: 2013 August 25 00:39:32 »
very nice image ! One of the best I have seen !


Offline slang

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Re: Zenithal Color Moon
« Reply #23 on: 2013 October 24 01:05:46 »
Hi Again.


Thanks. As I said, the workflow is pretty straight forward:   
1. Data reduction (bias,darks,flats) of RAW subs
2. Debayering
3. Selection of a reference sub
4. StarAlignment, with distortion correction enabled, and 8 wavelet layers in star detection. You may want to reduce the Maximum Distortion parameter to increase the number of alignment points. Check alignment with Blink.
5. ImageIntegration, with Winsorized sigma clipping and a rather low sigma level (about 20% rejection).
6. Color calibration
7. Wiener filtering (inside ResaurationFilter). I used a small PSF, you will have to experiment.
8. HistogramTrasformation
9. LocalHistogramEqualization
10. Several cycles of color saturation and chrominance noise reduction.

best
Ignacio

I'm working through a _reasonable_ data set, with many that may need rejecting. I have finally managed to get the star alignment to behave as I need so am very happy. With your comment '...rather low sigma level (about 20% rejection)' - how are you setting this? I've tried various sigma high and sigma low, but can't find where/how to set it this way.

Cheers -
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Mount: Orion Atlas 10 eq-g, GSO RC8, Astrophysics CCDT67
Guiding: ST80/QHY5L-II-M
Cam: Canon EOS 450D (IR Mod), QHY8L

Offline MikeOates

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Re: Zenithal Color Moon
« Reply #24 on: 2013 October 24 01:54:49 »
Oh my, that is a very, VERY good image. I love the subtle colours, so easy to over do it, this is spot on, well done Ignacio.

Mike

Offline Ignacio

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Re: Zenithal Color Moon
« Reply #25 on: 2013 October 24 05:50:05 »
Many thanks, Philippe and Mike.

Slang: if my memory serves me, I think I used something like 1.2-1.5x sigma in the rejection parameters. I do remember having about 20% of high pixels rejected and somewhat less on the low side. Hope it helps.

Ignacio


Offline micimax

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Re: Zenithal Color Moon
« Reply #26 on: 2013 October 25 01:04:03 »
Congratulations, it's a wonderful image. Interesting processing.