21 segment mosaic 28 May 2024

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21 segment mosaic 28 May 2024

Post by Alto »

Main concern is the 6 blotches showing on the disc - Proms are a little faint or non existent due to difficulty in removing glare!

Can anyone suggest improvements - especially with the botches - I only use AF2 and have run out of options this morning :(


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Re: 21 segment mosaic 28 May 2024

Post by Dennis »

Hi,
if you post your used equipment im sure somebody can say something about it. What is AF2?

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Re: 21 segment mosaic 28 May 2024

Post by Alto »

Sharpcap Mosaic Tool
AS4
Astrosurface as imppg refused to work with large files
AF2


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Re: 21 segment mosaic 28 May 2024

Post by Alto »

Dennis wrote: Wed May 29, 2024 1:45 pm Hi,
if you post your used equipment im sure somebody can say something about it. What is AF2?

Regards
Apologies Dennis, AF2 is Affinity Photo 2


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Re: 21 segment mosaic 28 May 2024

Post by rigel123 »

The artifacts from building the mosaic aren’t too noticeable at full resolution. What camera and scope setup are you using?


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Re: 21 segment mosaic 28 May 2024

Post by Alto »

rigel123 wrote: Wed May 29, 2024 5:17 pm The artifacts from building the mosaic aren’t too noticeable at full resolution. What camera and scope setup are you using?
William Optics 102GT masked to 90, Quark and PlayerOne Apollo M Max - so at critical sampling f33, or thereabouts.


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Re: 21 segment mosaic 28 May 2024

Post by Carbon60 »

Hi Geoff,

How uniform is your Quark? For successful mosaics, each pane has to be almost perfectly uniform, otherwise they can appear patchy when stitched together. I sometimes have this problem when the etalons on my Lunt 60 are not properly tuned or 'clocked' to minimise gradients across the field of view. This gets more challenging with really large mosaics such as yours. Try taking flats for each pane, or flatten each pane during processing and then stitch. The challenge then is that the whole disk can look too flat and unnatural. It's a question of judgement how much post processing to apply.

One final thing...if the panes are not uniform, then try adjusting (rotating) the Quark and flex the rear of the scope to see if these make any difference. I'm not a Quark user (I sent mine back because it was awful), so I don't know for sure if these efforts would actually make a difference, but it would be worth trying.

Perhaps Quark users could add a comment about achieving image uniformity?

Stu.


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Re: 21 segment mosaic 28 May 2024

Post by HAL »

Beautiful surface detail.

Photoshop has a tool to auto-blend panels when you create a mosaic. Does AF2 have something similar?


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Re: 21 segment mosaic 28 May 2024

Post by rigel123 »

I agree with Stu, it’s going to be a real challenge on a full disk with that many sections with any setup to get a really smooth surface putting a mosaic together.


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Re: 21 segment mosaic 28 May 2024

Post by Alto »

@stu

I think the Quark is reasonably uniform - certainly individual segments appear reasonably flat in tone. It would be difficult if not impossible to take a flat prior to each capture whilst using the Sharpcap Mosaic tool - though I take your point.

It took about 6 minutes to capture all the frames, adding a flat between each would add at least 6 if not more time.

I am told, though, that at 100% the blotches aren't that obvious, though a 33 inch diameter print would be an expensive error to test. Might have to try A4s and create a mosaic in paper of a mosaic......

I'll persevere, even if it means adding a 0.5 reducer to the camera.

@HAL - I'm sure it does, just need to experiment more though there are few solar mosaics that have Affinity in the process according to youtube.

@rigel - did you say challenge............


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Re: 21 segment mosaic 28 May 2024

Post by Alto »

The Solar Mosaic tool in SC has an auto exposure option, I'll experiment with that option too, rather than allowing it to use my dialled in figures - though on reflection I think most of the errors in the Mosaic are in the stitching.

Hopefully the weather forecast for the weekend, to come, is good!


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Re: 21 segment mosaic 28 May 2024

Post by rigel123 »

Alto wrote: Thu May 30, 2024 11:35 am @stu

I think the Quark is reasonably uniform - certainly individual segments appear reasonably flat in tone. It would be difficult if not impossible to take a flat prior to each capture whilst using the Sharpcap Mosaic tool - though I take your point.

It took about 6 minutes to capture all the frames, adding a flat between each would add at least 6 if not more time.

I am told, though, that at 100% the blotches aren't that obvious, though a 33 inch diameter print would be an expensive error to test. Might have to try A4s and create a mosaic in paper of a mosaic......

I'll persevere, even if it means adding a 0.5 reducer to the camera.

@HAL - I'm sure it does, just need to experiment more though there are few solar mosaics that have Affinity in the process according to youtube.

@rigel - did you say challenge............
Ya gotta love a good challenge! ;)


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Re: 21 segment mosaic 28 May 2024

Post by marktownley »

Nice disk Geoff. Flats may be the way forward.


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Re: 21 segment mosaic 28 May 2024

Post by Alto »

Thanks Mark. Alternatively find an easy(ish) way to apply a pseudo flat - attempts following some examples elsewhere haven't worked for me (though they were PS and not Affinity).


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