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Flare and proms Aug 3

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#1 DavidM

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Posted 03 August 2014 - 10:32 PM

Some interesting activity at the moment. A flare from AR2132 sent some ripples (and plasma?) through to the prom on the SE limb.

 

Full size here:

http://scopetrader.c.../888003E-02.jpg

http://scopetrader.c...otos/980633.jpg

http://scopetrader.c...tos/7423517.jpg

http://scopetrader.c...tos/5616419.jpg

http://scopetrader.c...tos/8481562.jpg

http://scopetrader.c...tos/1643183.jpg

http://scopetrader.c...tos/5888788.jpg

http://scopetrader.c...tos/9652979.jpg

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#2 DavidM

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Posted 03 August 2014 - 10:33 PM

3 & 4



#3 DavidM

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Posted 03 August 2014 - 10:37 PM

3 & 4

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#4 DavidM

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Posted 03 August 2014 - 10:39 PM

5 & 6

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#5 DavidM

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Posted 03 August 2014 - 10:52 PM

Lastly, 7 & 8

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#6 Philip Levine

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Posted 04 August 2014 - 10:05 AM

David,

Outstanding.  What processing did you use?

Phil


Edited by Philip Levine, 04 August 2014 - 10:06 AM.


#7 DavidM

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Posted 04 August 2014 - 11:21 AM

Thanks Phil. I stacked the best 20% of the frames in Autostakkert, used wavelets in Registax, and curves and levels (and colouring) in Photoshop. Nothing too involved, the scope does most of the work.



#8 rigel123

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Posted 04 August 2014 - 12:16 PM

Excellent shots David!  Do you like your stacking results better from Autostakkert than from Registax?



#9 DavidM

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Posted 04 August 2014 - 07:18 PM

I changed from Registax a while back (last version, I think), first to Avistack, and then to Austostakkert, which gave slightly better results again (it seemed to pull out the last bit of fine detail in the final image). There wasn't a huge amount in the final images, but I found Autostakkert also runs faster than Avistack, which is a plus when you have a lot of data. I couldn't say if Autostakkert is better than the current version of Registax because I haven't used it for anything other than wavelets.



#10 HPaleske

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Posted 07 August 2014 - 01:42 AM

Beautiful shots, especially the prominence picture

 

cs Harald

www.unigraph.de



#11 Andrev

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Posted 07 August 2014 - 04:28 AM

WOW David.

 

Incredible images, so crisp, so detailed. Congratulation.

 

Andre.



#12 chuck p

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Posted 07 August 2014 - 05:56 AM

David,

Excellent shots!!

Chuck



#13 NeilMac

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Posted 07 August 2014 - 10:29 AM

Awesome !



#14 NOMH

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Posted 09 August 2014 - 09:21 PM

Outstanding! I like your false color blend and the detail is awesome.

 

JB



#15 Arne Danielsen

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Posted 10 August 2014 - 03:12 PM

Lovely set of images David!

 

I especially like the prom and the disc/prom images.

 

Care to share the gamma settings for your recordings and elaborate a bit on the processing done in PS?

 

Thanks and best regards,

Arne



#16 DavidM

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Posted 10 August 2014 - 08:28 PM

Thanks all.

 

Arne, for surface shots I use a low gamma (0.65 on my Skynyx, with 1 being the 'neutral' point). For prominences I use a relatively high gamma (about 2.2 I think) to capture the faintest wisps against the background. For an image with both, I still keep a reasonably high gamma, so as not to lose prom detail. No gain used at all. I haven't tested to see whether it really matters if I use low gamma for the surface (e.g. could I still get the same effect in post-processing). I use a little bit of contrast just to help see when the seeing is good, making sure not to clip the data by viewing the histogram. For initial focussing and setting the pressure tuner I turn the contrast up extremely high as allows me to focus on the fine details and check at what point in the tuning that the illumination is most even.

 

I capture using 12-bit, which makes the difference in picking up the range of brightness between the surface and proms. I always take flats for every group of images, making sure not to leave too much time between the images and the flat since the brightness of the flat needs to match (this was a particular problem where I used to live in Oman, where lots of atmospheric dust mean that the brightness of the sun changed significantly as it climbed higher in the sky).

 

After stacking in Autostakkert and using wavelets in Registax, I use Photoshop to do final sharpening using unsharp mask (until I can start seeing the noise), using a small radius (0.7), but this value will depend on the magnification - still need to play with this a bit to see what is best at different magnification. My intent is not to go too hard on the sharpening, though sometimes I do go a little too far when I look back at some images. The sharpening processing tends to force a narrow dark zone marginal to bright zones when you look in detail, which does make things seem sharper, but when done too much is introducing an artefact that was not really in the original view. I also have consciously avoided the 'hairy' look technique of sharpening, which does give apparently sharp features, but again I think this is introducing artefacts into the image (and looks a little bit like blurred 'double-vision' in some cases). Not to say that this is not a valid way to process (there are plenty of people producing excellent images in this style), just saying it is not to my personal taste.

 

I set the contrast and brightness using curves (I generally place 3 points at high, low and middle in the curve and play with them - must be pretty similar to using Levels). For surface and prom combinations, I reduce the brightness of the disk a little using Highlights/Shadows (you can't equalise the prom and disk brightness too much or the transition starts to look weird, so the disk brightness has to stay fairly high). Final colouring is done by playing with the RGB values (Colour balance tool), giving the same value for highlights, shadows etc. I am moderately red-green colourblind, so the final colour is always somewhat of a guess for me. I know now that my early images were fairly brown rather than orange/red.

 

Anyway, this is probably much more than you actually wanted to know. I imagine there are some more clever techniques that can be applied, but for me this is a reasonable balance between getting a decent image, and the time spent processing.

 

David



#17 Arne Danielsen

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Posted 11 August 2014 - 11:58 AM

Dear David,

 

Thank you so much for taking the time to give such a thorough walkthrough of your imaging and processing technique! This was exactly the type of information is was looking for.

 

Best regards,
Arne



#18 Montana

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Posted 11 August 2014 - 01:40 PM

Wow! these are spectacular images, especially the spicule layer :)

 

Alexandra








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