Flat Dark Calibrati...
 
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Apr 9 2026 APP 2.0.0-beta40 has been released !

It has a major performance boost of 30-50% over 2.0.0-beta39 from calibration to integration, for mosaics even faster! We extensively optimized many critical parts of APP. All has been tested to guarantee correct optimizations. Drizzle and image resampling is much faster for instance, those modules have been completely rewritten. Much less memory usage. LNC 2.0 will be released which works much better and faster than LNC in it's current state. Improved Outlier Rejection with LN 2.0 rejection. macOS CMD+A works now in file chooser ! And more, all will be added to the release notes in the coming hours...

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.

 

Flat Dark Calibration Problem

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(@whixson)
Black Hole
Joined: 8 years ago
Posts: 167
Topic starter  

APP won't apply my matching dark flats to my flats, says I have to have a bias or matching dark flats. I took my dark flats at the same time as my flats and with the same gain, temperature and exposure lengths. Here's the message

CRITICAL WARNING: flat-field calibration can not be performed correctly!

To be able to perform accurate flat-field calibration,
the provided flats need to be calibrated by either

- a MasterBias, of the same ISO/gain value as the flat frame, or
- a MasterDarkFlat of the same ISO/gain value and the same exposure time as the flat frame, or
- both



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

Could you send me a few of the flats and dark-flats?



   
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