UPDATE FROM MABULA
I have had a very rough 2 months unfortunately health wise. I was struck 3x in a row with bacterial infections. The second infection occurred  after a routine hospital checkup and I became very sick. I had to rest and take a lot of antibiotics. Once I was recovering and restarting work 1 month ago, I again became sick. The infection was not yet gone, so even more antibiotics and rest was needed. Needless to say, it took a lot of my energy and I needed a lot of rest.
Finally, the infection is really gone and my energy is coming back step-by-step now and I have started work again. I am terribly sorry to have kept you waiting for support. I will address all outstanding questions and e-mails step-by step and will be on the forum daily from today.
APP 2.0.0-beta47 will come soon as well, a lot of work was already completed before I became very ill, so the release is also nearly ready for you. Beta47 will be much faster actually. Many workflows will be more than 2x faster, mosaics can even be 10x faster than before because registration really received a major boost... all compared to beta46. Â Before I release it, I will make sure that everything is working properly and then I will release it.
Hi,
I'm working on a little 2x2 mosaic and I've noticed strange artefacts in the stars shape : scare center, dark borders...
The single stacked frames don't show any artefact, only the mosaic. See the joined picture : 300% zoom, single stacked frame on the left, mosaic on the right side).
By looking at my previous mosaics, the artefact is also there.
So I think the issue might come from the parameters used, or not 😀Â
Here are my usual settings :
3 - Â stars count at 5000
4 - quadrilaterals, scale 1 to 10, DDC and same camera and optic checked, mosaic registration mode and projective
5 - advanced mode and defaults parameters
6 - mainly defaults, full mode, LNC 1-3, MBB 15, no rejection, no drizzle
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Thanx for your feedback.
David
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300% - that is some pixel peeping 😊Â
Only thing that comes to mind immediately - you really need 5000, I usually use 3000 at best (although I don't think this has anything to do with your problem.
What is your imaging gear ?
Hi David @dav78,
It looks to me like there is downscaling in play together with Lanczos data interpolation. Are you creating the mosaic using frames with different image scales?
The artefacts migh be avoided by
- using another data interpolation filter, like Cubic B-Spline, or
- preventing the possible downscaling
- or using drizzle integration instead of non-drizzle integration, just enable drizzle, use scale 1.0, droplets of 1.0 and the tophat kernel, that should really give you better stars 😉
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Cheers,
Mabula
Hi,
@einari, yes 300% is definitely a huge pixel peeping 😉, the purpose was to show the issue. But looking at the full mosaic, it's not so bad, but some stars have a strange shape. My gear is A7S modified + TS Star 71.
@mabula-admin, thanx for your quick feedback ! The different pictures were just cropped to avoid bad sides, but they have the same scale, at least I think. I will try your solutions and be back here soon 😀Â
I tried a few things :
1 - lanczos3 as usual, with the issue
2 - Cubic-Spline : the stars are perfectly round, but much bigger, and very soft, as the background
3 - Drizzle 1 : the better result, with stars just a little bigger than the single stacked frame, but with a softer background
4 - Billinear : similar to drizzle 1, but the stars seem to be a little bigger.
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What do you think about those results Mabula ?
