Solarflats in Photoshop?

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Taipan
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Solarflats in Photoshop?

Post by Taipan »

Is there any way to make solarflats in PS from the maine picture? To remove newtonrings?
I have a asi120mm-s. Could i solve the problem IF i by another camera? A celestorna skyris maybe? Or try another asi120mm-s? Didn’t have the problem withmy old asi120mm(usb2)


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Re: Solarflats in Photoshop?

Post by PDB »

Newton Rings are more or less easy to removr in the image by using an Fast Fourier Transformation Filter in the Photo Editing Software. I do not use PS but Gimp with Gmic filters (free software, and the latest version can handel images with up to 32 bit bitdepth), so don't know if such filters are available in PS (probably yes)
Will see that I can make some illustrated instructions later today and place them on the forum.

Rgrds,

Paul


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Re: Solarflats in Photoshop?

Post by Taipan »

I Will experiment with the gradient filter tonight and se IF i could make it better.
Maybe the gradientxterminater is a god tool for this?
http://www.rc-astro.com/resources/GradientXTerminator/


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Re: Solarflats in Photoshop?

Post by PDB »

Hi,

never tried that for NR's. (I sometimes use the gradient tool in the old IRIS software get a more equal surface). Might work, think you just need to try it.

I attached an instruction document to get rid of the NR's in Gimp. I could not post it in the reference library so attached it here.

Rgrds,

Paul
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Re: Solarflats in Photoshop?

Post by Taipan »

Tanks man. Tryed the Gimp thing and it worked prety well i think :)

And i didn't meen the gradient filter, ment the hi pass filter... Sorry.


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Re: Solarflats in Photoshop?

Post by Taipan »

But if i don't get the two dots??
What do i do then??
Tryed with another "old" pic with more NR.
/M
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Re: Solarflats in Photoshop?

Post by PDB »

Hi,

on the verticalline there are some small spikes (going left above center, right below center). I think these indicate the NR's. Usually it is a pattern that you see in the opposite quadrants.

Paul

PS: never was able to make it work in color images. That gives strange results due to the 3 channels in the image. Best is to work on monochrome images.


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Re: Solarflats in Photoshop?

Post by Taipan »

Some small spikes... Do you mean those?
Should i just make them black like in the PDF??
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Re: Solarflats in Photoshop?

Post by PDB »

Hmm; firsy thought these were the ones, but closer look I doubt. If this is from your color image, the NR's seem very faint, so difficult to find.
I would experiment and see how the image changes. But as it is color don't think you get result. You could try to convert a copy back to monochrome B&W and experiment on that one.

Paul


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Re: Solarflats in Photoshop?

Post by PDB »

Did a quick test on the image. They are indeed in those spikes but very difficult to remove. You will need to do some carefully painting ...


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Re: Solarflats in Photoshop?

Post by Taipan »

Ok. You can se the picture upove. Faint, yes maybe..

My first try was on a colour image. And it worked quite well i think. Se pics
Guess i just have to try a little bit more :)
But tnx for the input.
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Re: Solarflats in Photoshop?

Post by PDB »

Starts to look good!


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Re: Solarflats in Photoshop?

Post by Taipan »

Did some more footage today. This is a stacked JPG and the pic from the filter. I might be stupid but i can't se what i should paint black. Maybe this metod doesen't work in my camera or something?
Is there another way to get rid of the Nr on the computer? Tried to make a solarflat but can't get it to work..
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Re: Solarflats in Photoshop?

Post by FlankerOneTwo »

You might try looking in Mark Townley's thread "Review of the Solutions to Newtons Rings in Solar Imaging"
viewtopic.php?f=27&t=21719

I found it difficult to remove the rings satisfactorily in post processing. Far better to reduce them before acquisition, I found tilting the camera to work best. The Daystar Interference Eliminator does it nicely for me. The ZWO tilter did not have enough range to remove the rings generated by an ASI1600 combined with a PowerMate (either 2.5x or 5x) on my LS80.


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Re: Solarflats in Photoshop?

Post by PDB »

I might be stupid but i can't se what i should paint black
No you are not. This one is almost impossible to to. The bands are hidden in de V shaped white areas, but very close to other details. So if you hit the wrong pixels (and my hand is not steady enough) you will erase or darken other areas in the image. So does not seem to work for every image :(

After a Quark (f/24) I also need to tilt the ZWO ASI120 very heavily. At f/12 they are still very visible. With the ASI178 at f/24 visible at f/12 they are gone. So very camera dependent.

Paul


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Re: Solarflats in Photoshop?

Post by Taipan »

:). Ok, tnx.

Did some tests with the median filter in PS. Inverted it and blended it.
So this is todays sun. :) The NR is still there but a little bit less of it i think.

Now time for Hockey :). Go Sweden!! :) He he.
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Re: Solarflats in Photoshop?

Post by PDB »

So not a final Sweden - Finland. (How did the Fins get beaten by the Swiss???)


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Re: Solarflats in Photoshop?

Post by allhoest »

Paul, very interesting technique you propose.
:bow2

I have a more complex pattern on one of my setup: a combo of newton rings and horizontal banding.
Image





I use to make a flat, but often, I finish with some slight remaining horizontal pattern in my image (difficult to discern.

Mmmm, do you think that your technique could help?
Maybe in 2 steps, one for the rings and one for the banding?

Or maybe I should proceed normally with flat. And then take care for residual horizontal banding?



CS
Alex


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Re: Solarflats in Photoshop?

Post by Taipan »

They have a very good goalkeeper. And they have nothing to lose so they just go for it..
The Swis beet tha Canadians yesterday also....
This final might be intresting :)


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Re: Solarflats in Photoshop?

Post by Taipan »

So, in this one. Do you se any NR? Maybe a little bit to much sharpening but focus on the NR..
Used an inverted Median filter in PS.. Not the best way to go but think it worked ok..
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Re: Solarflats in Photoshop?

Post by PDB »

Looks ok to me. (Must try that someday as well, but currently my equipment is a little bit out of order)

Rgrds,

Paul


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Re: Solarflats in Photoshop?

Post by Taipan »

FlankerOneTwo wrote: Sun May 20, 2018 4:11 pm You might try looking in Mark Townley's thread "Review of the Solutions to Newtons Rings in Solar Imaging"
viewtopic.php?f=27&t=21719

I found it difficult to remove the rings satisfactorily in post processing. Far better to reduce them before acquisition, I found tilting the camera to work best. The Daystar Interference Eliminator does it nicely for me. The ZWO tilter did not have enough range to remove the rings generated by an ASI1600 combined with a PowerMate (either 2.5x or 5x) on my LS80.
My problem is that i don't get enaugh backfocus to use a tiltadaptor. Se pic how i try to do this today :)
Did try the first adaptor in the link and i couldn't reach focus. But the second one seams thinner, maybe the "Interference Eliminator" would make me reach focus..
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Re: Solarflats in Photoshop?

Post by marktownley »

Use a female t2 thread ring - take the nosepiece off the diagonal and use the female ring to connect the diagonal directly to the back of the helical. That will save you valuable focus.


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