Looking for opinion on corona processing

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george9
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Looking for opinion on corona processing

Post by george9 »

I am looking for opinions on processing. Of these versions of the same coronal image from 2023-09-16, it would be helpful to hear which processing people like best.

I have been working on how to fit the wide dynamic range into what is visible on the screen. I've been trying brightness-contrast, Photoshop levels, various subtractions (remove radial gradient to make the brighter innermost corona more like the outer corona), and curves (e.g., sacrifice the mid range but keep bright streamers and dim extension).

Here they are in the order I generated them.

George

#1
Hripcsak 2023-09-16-1614_0-1633-6-CapObj_____100r_48T_46reg_substract unsharp masked_70_10 levels.jpg
Hripcsak 2023-09-16-1614_0-1633-6-CapObj_____100r_48T_46reg_substract unsharp masked_70_10 levels.jpg (275.13 KiB) Viewed 884 times

#2
Hripcsak 2023-09-16-1614_0-1633-6-CapObj_____100r_48T_46reg_substract unsharp masked_70_10 levels2.jpg
Hripcsak 2023-09-16-1614_0-1633-6-CapObj_____100r_48T_46reg_substract unsharp masked_70_10 levels2.jpg (247.14 KiB) Viewed 884 times

#3
Hripcsak 2023-09-16-1614_0-1633-6-CapObj_____100r_48T_46reg_substract curves unsharp.jpg
Hripcsak 2023-09-16-1614_0-1633-6-CapObj_____100r_48T_46reg_substract curves unsharp.jpg (223.01 KiB) Viewed 884 times

#4
Hripcsak 2023-09-16-1614_0-1633-6-CapObj_____100r_48T_46reg_substract3 copy.jpg
Hripcsak 2023-09-16-1614_0-1633-6-CapObj_____100r_48T_46reg_substract3 copy.jpg (259.73 KiB) Viewed 884 times

#5
Hripcsak 2023-09-16-1614_0-1633-6-CapObj_____100r_48T_46reg_substract4 curve unsharp.jpg
Hripcsak 2023-09-16-1614_0-1633-6-CapObj_____100r_48T_46reg_substract4 curve unsharp.jpg (477.5 KiB) Viewed 884 times


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Re: Looking for opinion on corona processing

Post by cte »

Hi, I'm not an expert in solar processing, but number 2 is the one I like the most. It is detailed and natural looking. Besides they are all very good for such difficult and faint subject.


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Re: Looking for opinion on corona processing

Post by KMH »

I think for me #4 provides the best balance of clarity of features and dynamic range.

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Re: Looking for opinion on corona processing

Post by cybermayberry »

4 Does it for me the most.


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Re: Looking for opinion on corona processing

Post by DeepSolar64 »

No2 is my favorite but all are F@&K@>G AWESOME!! :bow

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Re: Looking for opinion on corona processing

Post by marktownley »

I'm on number 2 George! Great results!


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Re: Looking for opinion on corona processing

Post by Valery »

#4 - best for my monitor and eyes/brain.


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Re: Looking for opinion on corona processing

Post by Montana »

I was split between number 2 or 4, but I think number 2 wins (don't ask me why :) )

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Re: Looking for opinion on corona processing

Post by rigel123 »

Like others, I like #2 and #4 the best.


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Re: Looking for opinion on corona processing

Post by arnedanielsen »

I put my money on #2


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Re: Looking for opinion on corona processing

Post by rsfoto »

Hi,

As usual that is a subjektive question and I would ask you ¿what do you want to show?

An aesthetic image or a scientific image. Aesthatically any image is OK for me but scientifically seen number 5 tell me the most.

Rainer


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Re: Looking for opinion on corona processing

Post by pedro »

I also prefer n.º 2

great corona images by the way


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Re: Looking for opinion on corona processing

Post by george9 »

Thank you all for the awesome response!

And very useful because I was not necessarily expecting this result. I think aesthetically, people are preferring the cleaner images of #2 and #4. So for presentation, I should be careful to keep it clean.

As Rainer said, I was focused on what is the max you can see, and that would be one of the brighter ones, like #5.

In fact, I had worried that the brighter ones were pulling in too much background scatter and passing it off as corona. But on the other hand, as Klaus pointed out elsewhere, the annular eclipse images (viewtopic.php?t=42935) prove that the glow is substantially corona and not just scatter, or else we could not see the Moon 15 minutes before the eclipse first contact.

By the way, GregAlt did his processing script on my image on CN here: https://www.cloudynights.com/topic/8916 ... p=13064161 . It shows even more detail.

George


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Re: Looking for opinion on corona processing

Post by Valery »

Took a next look at them and now #2 is the best for me.


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Re: Looking for opinion on corona processing

Post by george9 »

By the way, here is a raw frame from the Empire State Building video. No adjustment other than lowering the resolution for posting.

It gives you a feel for what is due to instrument scatter versus sky background and corona.

Dim grey area over the Empire State Building: this is due to scatter in the instrument, including dust on the lens.

The outermost ring shows some vignetting.

Just inside that but still pretty far out: this is sky brightness plus the instrument scatter.

The increasing brightness as you approach the cone is mostly corona

Surprisingly, Klaus and I have found that at this close distance to the Sun, the sky background is relatively constant. Sure it decreases slowly as you move away from the Sun, but at this magnification, you don't much notice a radial gradient in sky background.

The decreased brightness on the other side of the Empire State Building is I think due to lower instrument scatter far away from the Sun (since the building is blocking that half of the Sun).

In general I tend to get a bit of a gradient from the lower left (brighter) to the upper right (dimmer) in my other photos. I have not figured out why.

George
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Re: Looking for opinion on corona processing

Post by marktownley »

Very interesting thanks George


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