Mosaic shooting- po...
 
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Mosaic shooting- possible crop individual panels before integration?

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(@xone)
Brown Dwarf
Joined: 6 years ago
Posts: 5
Topic starter  

Wondering if this is possible or something you've thought about adding. I want to shoot a mosaic with a full frame camera. The corners are not perfect at FF on my setup, it would be nice if I could somehow crop just like 5-8% off the left and right of each frame before integration and avoid it integrating the corners. This would still give me a much better field of view than a smaller camera but better result and not needing to cover a perfect FF field or merge the bad parts of the frame.



   
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(@Anonymous 174)
Joined: 9 years ago
Posts: 5702
 

You can perform a crop on all frames if you want, is that what you're looking for? Tools menu -> batch crop



   
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(@xone)
Brown Dwarf
Joined: 6 years ago
Posts: 5
Topic starter  
Posted by: @vincent-mod

You can perform a crop on all frames if you want, is that what you're looking for? Tools menu -> batch crop

Does this work on raw data pre-integration? then I can load cropped fits and integrate/debayer fine as normal like it just came out of the camera that way? 



   
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(@Anonymous 174)
Joined: 9 years ago
Posts: 5702
 

I think so yes, I do have to say I never used that tools specifically as I always tend to just make the mosaic and then crop when required (I would advice that as well btw).



   
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(@xone)
Brown Dwarf
Joined: 6 years ago
Posts: 5
Topic starter  
Posted by: @vincent-mod

I think so yes, I do have to say I never used that tools specifically as I always tend to just make the mosaic and then crop when required (I would advice that as well btw).

To clarify my reasoning- it's the edges of the frames that are a problem so if you integrate a mosaic as is where the edges of each frame overlap there will be areas of bad stars/vignette which I don't want. I'm not trying to crop a finished mosaic I just don't want areas integrated with poor data. If you are overlapping parts of frame with not great data you will have a grid in the finished mosaic that is lesser quality stars. this can be noticeable on a lot of big mosaics if you look closely. 


This post was modified 4 years ago by Jason Kurth

   
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(@wvreeven)
Quasar
Joined: 8 years ago
Posts: 2134
 

@xone Be very careful with this if you apply to raw data. It means that you need to crop your calibration data to exactly the same dimensions and exactly the same sub-frame as the lights otherwise you may run into problems with flat field correction.



   
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(@connor231)
Neutron Star
Joined: 6 years ago
Posts: 102
 

I'm interested in this too. I have just started playing with mosaics, but I thought the best practice was to integrate the panels separately and mosaic the integrations as if they were lights. That means you could crop as much as you want as long as you leave enough overlap - and you don't have to worry about calibration problems as you would calibrate using the usual methods.

I only say this because I understood that a big mosaic might have thousands of frames and it is much faster to integrate the panes separately.



   
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(@xone)
Brown Dwarf
Joined: 6 years ago
Posts: 5
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Posted by: @wvreeven

@xone Be very careful with this if you apply to raw data. It means that you need to crop your calibration data to exactly the same dimensions and exactly the same sub-frame as the lights otherwise you may run into problems with flat field correction.

Yeah good point I guess this is not such an easy solution then... it would be nice if there was an integrated functionality in the APP mosaic function to do this without causing issues or extra steps- just specify an X and Y crop factor before integrating



   
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(@Anonymous 174)
Joined: 9 years ago
Posts: 5702
 

I guess you can calibrate your data, save the calibrated frames and then crop those? Saving of calibrated frames can be done in tab 2, all the way down.



   
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