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2022-08-17: APP 2.0.0-beta3 has been released !

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windows 2.0.0-beta3

macOS x86_64 2.0.0-beta3

macOS arm64 M1 2.0.0-beta3

Linux DEB 2.0.0-beta3

Linux RPM 2.0.0-beta3

Super Pixel Resolution


(@jim)
Brown Dwarf Customer
Joined: 2 years ago
Posts: 12
Topic starter  

I just tried using the "Super Pixel" algorithm. I was expecting the integration result file to have a resolution of about half that of my original images, but it is about the same. I got a 3011x3014 output from 3008x3008 exposures.

I thought a block of 4 pixels would be converted to 1 pixel.

Have I misunderstood what Super Pixel does?


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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4930
 

Be adviced that superpixel throws away possible valuable data, it's usually used to get a kind of preview on the data. Here's a snippet of the tooltip for it, it averages pixels before any de mosaic is performed :

image

I think it's better to try lowering the integrate scale (integrate tab, all the way down), if your goal is to simply downscale.


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(@jim)
Brown Dwarf Customer
Joined: 2 years ago
Posts: 12
Topic starter  

@vincent-mod Thanks for that. Jim


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(@jim)
Brown Dwarf Customer
Joined: 2 years ago
Posts: 12
Topic starter  

I tried Super Pixel again and it now produces a half width and half height image as you would expect.


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(@jim)
Brown Dwarf Customer
Joined: 2 years ago
Posts: 12
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...and now Super Pixel produces original sized images rather than half sized ones again!

Perhaps some other parameter overrides it?


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(@jim)
Brown Dwarf Customer
Joined: 2 years ago
Posts: 12
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...and now it's working again.


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(@wvreeven)
Galaxy Admin
Joined: 4 years ago
Posts: 1816
 

@jim Intriguing! What changed in between attempts? Did you choose different parameters? Did you restart APP? What version of APP are you using?


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(@jim)
Brown Dwarf Customer
Joined: 2 years ago
Posts: 12
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Posted by: @wvreeven

@jim Intriguing! What changed in between attempts? Did you choose different parameters? Did you restart APP? What version of APP are you using?

I had tried changing composition options (full, reference and crop) but that didn't seem to make any difference. I also tried restarting APP but that didn't help. However the following day, after a PC shutdown and restart, it worked again. 

I'm on 2.0.0-beta2


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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4930
 

Interesting indeed. You opted not to simply downscale then in the integrate tab?


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(@jim)
Brown Dwarf Customer
Joined: 2 years ago
Posts: 12
Topic starter  
Posted by: @vincent-mod

Interesting indeed. You opted not to simply downscale then in the integrate tab?

Is that better than "Super Pixel" in any way?

This post was modified 2 months ago by Jim Smith

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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4930
 

If you want to downscale the image, then yes that would be better. Super pixel can throw away some of the data, which might impact a better registration of the data.


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