Creating Bad Pixel ...
 
Share:
Notifications
Clear all

31 July 2020 - Comet Registration video tutorial using APP 1.083-beta1 released.

30 July 2020 - APP 1.083-beta1 has been released introducing Comet processing! This 1st beta has comet registration. The stable release will also include special comet integration modes.

9 July 2020 - New and updated video tutorial using APP 1.081: Complete LRGB Tutorial of NGC292, The Small Magellanic Cloud by Christian Sasse (iTelescope.net) and Mabula Haverkamp

2019 September: Astro Pixel Processor and iTelescope.net celebrate a new Partnership!

Creating Bad Pixel Map  

  RSS

(@john-quinn)
White Dwarf Customer
Joined: 4 months ago
Posts: 18
August 7, 2020 22:17  

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
image
image

 

 

 

This topic was modified 2 months ago by John Quinn

ReplyQuote
Topic Tags
(@vincent-mod)
Quasar Admin
Joined: 3 years ago
Posts: 2453
August 9, 2020 11:01  

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.


ReplyQuote
(@john-quinn)
White Dwarf Customer
Joined: 4 months ago
Posts: 18
August 9, 2020 17:00  

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 months ago by John Quinn

ReplyQuote
(@vincent-mod)
Quasar Admin
Joined: 3 years ago
Posts: 2453
August 9, 2020 18:30  

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.


ReplyQuote
(@john-quinn)
White Dwarf Customer
Joined: 4 months ago
Posts: 18
August 9, 2020 18:55  

@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 months ago 2 times by John Quinn

(@vincent-mod)
Quasar Admin
Joined: 3 years ago
Posts: 2453
August 9, 2020 19:17  

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


ReplyQuote
Share: