MOSAIC cannot be done, help

What are your registration settings,
can you screenshot those?

Registration settings are the deffault ones. I only changes the overlap to 10% instead of 5%. All the other settings deffault.

I'd recommend having a look at this tutorial for different FL mosaic... and the understanding of it: 
https://www.astropixelprocessor.com/mosaic-tutorial-milky-way-to-rho-ophiuchi-by-mabula/

@gideon96 many thanks. I'll check it 😉

Best regards,

Aleix

@aleix

After checking the video out, some pointers:
- Sometimes, depending on when, how, how time apart, the panes were shot, it helps crop/fix BG light pollution/illumination for the benefit of the final mosaic.
- Use LNC on the final mosaic combo, experiment with settings, the video shows.
- Another video by Sara Wager, shows stitching a mosaic in one go. I tried it a few times, but it depends on the data, amount of panes, if they all overlap one another (like 1x3, 4x4, etc).

Good luck!
IMO, APP is the best software for astro mosaics, (among other benefits).

@gideon96

Thanks. Also for me, APP is the BEST EVER software for data calibration and mosaics. I always recommend it in many other forums, speechs, and social networks. It's a game changer.

One final question: hte mosaic is created using LINEAR or STRETCHED data?

@aleix

The Mosaic is stitched in the pre-streched part of the process...
Only after you have the final stitched mosaic do you start process.

You might do (depending on the data)  some LP/Gradient removal before stitching the individual panes, but they are still pre-streched before the final integration.

Thanks so much for your help. It's so welcome the fast answer 🙂

@gideon96 I followed all the TUTO's from Mabula and your recommendations and still cannot create the Cygnus Mosaic. Could you help me please? It says that I have problems with star analysis... Many thanks.

I'm trying to increase the resolution of the wide field image, not a standard mosaic were you stitch panels. Is that ok?

Full data details here: https://astrocat.info/cygnus-extreme-a-4-year-wide-field-image/

Will I be able to get a result with APP?

Posted by: @aleix

It says that I have problems with star analysis...

What version of APP are you using? If it is 1.083-beta2, can you try with 1.082 or 1.083-beta? Star analysis in 1.083-beta2 occasionally has a glitch and Mabula is working on a fix.

@aleix

Hey, Aleix!, I just realized it's you from twitter! 😀

That looks like a fun project!
But I'm trying to understand what you said regarding increasing resolution? You are not stitching panels/images together?

@aleix

In the registration, did you increase the scale stop, to 10 for example? That usually help with registration if you have chosen enough stars (4000 stars instead of 500 I would suggest to start with).

In the Normalization tab, is 'advanced' chosen instead of 'regular' normalization? Advanced normalization is good for mosaics and may be important if you are playing with resolution.

How are you trying to modify resolution, bayer-CFA drizzle or similar, of just increase the scale of already stitched mosiac?

You may already have tried these, but if the views are from different scope AND/OR different frame orientations, choose 'flip x-y descriptors' and uncheck 'same camera and optics' (even when you use the same scope) in the registration tab. that helps a lot.

@gideon96 Yes I'm stitching together, but the pannels have different resolutions:

-Full Field at 9"/pixel

-Details at 2"/pixel

I hope it will get a final image at 2"/pixel?

@wvreeven 1.082 and it does not work...

@cwm2col I did all you pointed out except the FLIP. I will try now.

About resolution I have no clue on how to do it...

May I ask you to contact me via email so we can find the solution? I quite desperate... too many weeks trying to stitch this mosaic without succes.

info@astrocat.info

Many thanks for your work and help,

Aleix

@aleix

The resolution will depend on which frame you choose as reference. The wide field can be scaled down to match the narrow field, but the resolution cannot be modified as much as this after the fact. But, it will be like adding a binned signal to the image.

Or you can choose the wide field frame as the reference image and increase the resolution by adding the 2"/px data

@aleix

email sent

@cwm2col That sounds really good.

I already recieved the email. Thanks for your fats reply. Hope we can solve it. Many thanks for your time and work.

It finally produced a result. But it's odd :_)

What I did? I cropped the WIDE filed from the Sigma Art 85mm to be the same as one of my FSQ85 (450mm focal lenght) images (central part, Buterfly Nebula).

The result looks like abstract art :/

@aleix

I have seen this before myself and also in another persons data, when different system data were mixed. The mosaic worked when some data was left out.

Reference: Stacking images from different sources? – Page 2 – General – Astro Pixel Processor Forum

Try adding the horsehead form the Tak to the Sigma art widefield, just in case the butterfly is actually the problem data.

Also, untick 'distortion correction' just in case.

I believe the 'iterative master' approach is the best to form the eventual mosiac (widefield + 1 tak stack to create the new master and then iteratively add the tak data one by one), but also to see which files cause problems.

Many thanks Colm. I will give a try to that.