9 replies to this topic

[skydivephil]

Do any of the gradient removal tools used in deep sky imaging work for solar? Any other tips for gradient removing?

I did take flat but the software Im using (ASI studio) doesnt seem to take them 

 

[steveward53]

Which gradient ?

 

The Sun's limb is noticably darker than the centre of the disc so it's not a 'gradient' as you get in a DS image.

[rigel123]

Do any of the gradient removal tools used in deep sky imaging work for solar? Any other tips for gradient removing?

I did take flat but the software Im using (ASI studio) doesnt seem to take them 

Can you post an image so we can see the gradient you are referring to?

[BYoesle]

There are a multitude of gradients that narrow-band solar H-alpha filter systems can produce. Deep sky imaging stuff isn't usually applicable or appropriate to solar imaging, where "gradients" are usually due to etalon non-uniformities with resulting band-pass variation. Or you might have too much tilt to an etalon. A flat might even the brightness but do nothing to correct these bandpass issues, some of which might etalon system be user error.

 

Without the details of your filter and imaging system, and seeing the gradient you are referring to, there really is no way to answer your question.

[Tapio]

Agreed with all of the above.
White light or Ha?

FireCapture or Sharpcap highly recommended for solar imaging. And it can handle flat using too.

[skydivephil]

Sorry Ive been away and not had time to reply. Here is an image

Attached Thumbnails

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Edited by skydivephil, 18 May 2024 - 06:51 PM.

[davidpitre]

You might try switching to Firecature for capture. It can take and incorporate flats. What do you stack with? Autostakkert does a good job of adding flats.
In post processing, Photoshop or GIMP can be used to make artificial flats to remove gradients.
Marty or Simon Tang’s processing tutorials can show you how to do the latter.

[skydivephil]

I have a mac and so cant use Autostakkert. I am capturing using firecpature and am stacking with ASI studio . Their stacking software is so good , way way better than autostakkert but this seems to be its one floor. 

[Tapio]

If you can't use Autostakkert then how can you tell Asistudio is way better?

[BYoesle]

Without the details of your filter and imaging system...

There can still be no response because you haven't provided any details of you filter system or imaging system.

 

Provide these and a minimally processed greyscale image and there might be some progress.

 

Sincerely, your department of redundancy department.