Noise and Gradient
 
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May 27 2026 APP 2.0.0-beta45 has been released !

Fully Multi-Threaded LNC, many improvements for the registration engine, platform upgrade, and further tuning of internal memory consumption and memory release back to OS.

Apr 14 2026: Google Pay, Apple Pay & WeChat Pay added as payment options

Update on the 2.0.0 release & the full manual

We are getting close to the 2.0.0 stable release and the full manual. The manual will soon become available on the website and also in PDF format. Both versions will be identical and once released, will start to follow the APP release cycle and thus will stay up-to-date to the latest APP version.

Once 2.0.0 is released, the price for APP will increase. Owner's license holders will not need to pay an upgrade fee to use 2.0.0, neither do Renter's license holders.

 

Noise and Gradient

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(@deesk06)
Main Sequence Star
Joined: 6 years ago
Posts: 14
Topic starter  

Hi,

I have been having issues lately with processing in APP. Surely the issue has to be my camera. It is old, however I may just be doing something wrong during processing. I am getting a lot of noise and the gradients are really bad. I use the light pollution tool, which still cannot correct it. It does a good job removing light pollution, but the gradients just get worse. I will post a picture asap. 

Thanks!

APP


   
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(@ippiu)
Neutron Star
Joined: 7 years ago
Posts: 138
 

Hi @deesk06

I'm also pretty sure your issue is related to raining noise caused by hot pixels in the camera: is absolutely normal.

Even darks normally aren't able to correct it properly.

2 ways of get rid of raining noise:

- do dithering during imaging 

- build a well built bad pixel map through APP (this is the way i'm following)

I'm bulding a complete darks library: each 50 gain, each exposure (from 60s to 600s), at -10 °C.

After all sequence of each darks, i let APP create master dark and BPM with the same sequence of darks: so i will have (already ready) each BPM (and master dark as well) for a combination of gain/exposure. In this way i avoid completely doing dithering in the field: so i avoid, to say, one more potential issue in the field (since problems are always at the corner..)



   
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