Creating Bad Pixel ...
 
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2022-09-02: APP 2.0.0-beta4 has been released !

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Creating Bad Pixel Map


(@john-quinn)
White Dwarf Customer
Joined: 2 years ago
Posts: 19
Topic starter  

Hello...I spent seven hours on a cloudy night creating an assortment of calibration frames to include flats,dark flats and darks (30,60,90,120,180,300 sec) at ambient and 0C degrees.

When I created a BPM using the 31x 2 sec flats, 30x 2 sec dark flats and the 20x 180 second darks, it generated what I believe is a good BPM with 2.7% bad pixels. (I used auto settings). However, after I saved the BPM to a folder, and then tried to load it into APP, I get the message that it "does not appear to be a Bad Pixel Map" as it lacked the BPM metadata. When I clicked YES to load it anyway it loaded OK -it appeared identical when zoomed in- (third image, below) but it no longer displays the metadata as it does in the first image, below. Did I do something wrong? Will the BPM work in future processing attempts as it should? Thanks!

image
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This topic was modified 2 years ago by John Quinn

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(@vincent-mod)
Universe Admin
Joined: 5 years ago
Posts: 5001
 

Mmm that is weird, you didn’t change anything in between for the BPM? It should just be created and that’s it. No further processing should be done on it, or loaded into another program and then saved again. Things like that might change the fits data.


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(@john-quinn)
White Dwarf Customer
Joined: 2 years ago
Posts: 19
Topic starter  

Well, that is what I suspected. Although it was automatically saved to the directory folder after it was created, I did 'save' it again, and added a suffix to identify it (e.g. "-0C"). Will it need to stay in the original folder or can it be moved to a "Bad Pixel Map" folder without changing the name?...would simply moving it change the metadata? Thanks for the reply!

This post was modified 2 years ago by John Quinn

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(@vincent-mod)
Universe Admin
Joined: 5 years ago
Posts: 5001
 

No that should be fine, also renaming it would be ok I think as the fits header is what matters. But to be on the safe side for now, just save it in a folder for you to keep. A BPM can be used for at least a year on all your data, it never degrades data.


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(@john-quinn)
White Dwarf Customer
Joined: 2 years ago
Posts: 19
Topic starter  

@vincent-mod Thanks again...slowly getting more familiar with APP! I just now processed my first ever meridian flip in APP...no issues.   

Here is an image from July!

Eastern Veil Crop APP HaOIII

 

This post was modified 2 years ago 2 times by John Quinn

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(@vincent-mod)
Universe Admin
Joined: 5 years ago
Posts: 5001
 

Excellent! Good to hear. 🙂 I would make the background less dark though, but the signal is great!


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