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Mar 28 2026 APP 2.0.0-beta40 will be released in 7 days.

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Strange multiple colored dot cluster in integration result

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(@albedo)
Molecular Cloud
Joined: 7 years ago
Posts: 2
Topic starter  

Hi,

I'm trying APP, so I'm not an expert user and in general I'm not an expert in astroimage processing.

I shot 22 frames of Rosette nebula with my modded Canon  EOS550D some weeks ago and tried to integrate them in APP.

Strangely, I found quite a few colored dot cluster in the integration result, red, blue, white, everywhere.

Could you help me to understand what's wrong in my stesps (default settings everywhere, 22 frames of 5 min dithered, biases, flats, dark flats, NO dark)?

Attached you can find the integration result and a detail with circled in white some of the dot clusters.

 

Thanks,
Alberto 

 

DotClustersDetails RosetteNebula
St avg 6600.0s NR x 1.0 LZ3 NS full eq add sc BWMV nor AAD RE noMBB St

This topic was modified 6 years ago 2 times by albedo

   
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(@astrogee)
Black Hole
Joined: 8 years ago
Posts: 222
 

Yes, I get that too sometimes. Not sure why either but I'd like to know.



   
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(@minusman)
Black Hole
Joined: 9 years ago
Posts: 249
 

Verwenden Sie die neueste Version von APP? Wenn ja, aktivieren Sie den automatischen Modus während der Integration. In einer älteren Version muss Manuel die Ausreißer-Ablehnung aktivieren, z. B. Sigma-Clipping oder Mad Sigma. Dann sollten diese Hotpixel-Cluster verschwinden.
Zusätzlich würde ich eine schlechte Pixelkarte empfehlen. 20 Dunkelheiten bei 300s mit geschlossenem Kameradeckel.
Laden Sie dann Lights Darks, Flats und Bias und überprüfen Sie bpm unter Calibration.
Kalibrieren Sie dann die Bilder neu und integrieren Sie sie.

Mit freundlichen Grüßen

 



   
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(@albedo)
Molecular Cloud
Joined: 7 years ago
Posts: 2
Topic starter  

@minusman

V.1.075

I left everything default.

If I understood well, I have to try with the new version (I tried the download, buy It seems very very slow and doesn't complete).

I built a bad pixel map for a previous test, I'll try ti use that (but I'm dire there aren't so many bad pixel in my frames).

Come back with the results.s, thanks.

 

 

 



   
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