Why do I need bias ...
 
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UPDATE FROM MABULA

I have had a very rough 2 months unfortunately health wise. I was struck 3x in a row with bacterial infections. The second infection occurred  after a routine hospital checkup and I became very sick. I had to rest and take a lot of antibiotics. Once I was recovering and restarting work 1 month ago, I again became sick. The infection was not yet gone, so even more antibiotics and rest was needed. Needless to say, it took a lot of my energy and I needed a lot of rest.

 

Finally, the infection is really gone and my energy is coming back step-by-step now and I have started work again. I am terribly sorry to have kept you waiting for support. I will address all outstanding questions and e-mails step-by step and will be on the forum daily from today.

 

APP 2.0.0-beta47 will come soon as well, a lot of work was already completed before I became very ill, so the release is also nearly ready for you. Beta47 will be much faster actually. Many workflows will be more than 2x faster, mosaics can even be 10x faster than before because registration really received a major boost... all compared to beta46.  Before I release it, I will make sure that everything is working properly and then I will release it.

Why do I need bias to make master flats?

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(@bokemon)
White Dwarf
Joined: 6 years ago
Posts: 9
Topic starter  

Hello,

I got a new telescope, so I made a bunch of flats.  Now I want to use APP to make a set of master flats for later use.  However, it complains that I need to add bias or dark flats to make these master frames.  Why?  I thought a master flat was that you just stack all the flats (for one filter and gain setting) together.  I understand why you need bias and other types when actual processing images, but why during the making of the master frames?  BTW, I do have a master darks and bias library ready to use when processing real images.



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

So APP needs a bias signal to substract that signal from the flats. This is important for the algorithm to know what the actual backgound in the image is and to scale the rest properly.



   
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