Author Topic: Bias Problems  (Read 2319 times)

Offline cuivenion

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Bias Problems
« on: 2018 January 21 04:10:24 »
Hi, I'm a newbie so I'm going to have a lot of questions. Here's my first, I've been using this guide:

http://www.lightvortexastronomy.com/tutorial-pre-processing-calibrating-and-stacking-images-in-pixinsight.html#Section2

However my Master Bias just looks a blank gray image when auto stretched, nothing like in the guide, and my Super Bias looks like this (See Attached):

Does anyone have any idea what I'm doing wrong?


Offline dld

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Re: Bias Problems
« Reply #1 on: 2018 January 21 06:08:23 »
Hello,

Try viewing the superbias using the so-called 24-bit Lookup Tables mode. Press the "24" button located next to the "Enable/Disable Screen Transfer Functions (or from the menus: Image > Screen Transfer Functions > Use 24-bit STF LUTs).

Also, take a look at What is best practice using dark frames with an uncooled DSLR? if you are using a DSLR camera.

Offline cuivenion

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Re: Bias Problems
« Reply #2 on: 2018 January 21 06:28:57 »
That's great thanks, here is the bias now. It looks OK to me, what do you think?

Offline dld

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Re: Bias Problems
« Reply #3 on: 2018 January 21 06:36:36 »
It looks good to me too  :)

Offline cuivenion

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Re: Bias Problems
« Reply #4 on: 2018 January 21 06:40:20 »
Thanks!

Offline dld

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Re: Bias Problems
« Reply #5 on: 2018 January 21 06:57:41 »
You are welcome!

Please ignore (or leave it for later) the thread link I provided earlier. You may better take a look at: For beginners: Guide to PI's ImageCalibration. This is what I had initially in mind!

Offline cuivenion

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Re: Bias Problems
« Reply #6 on: 2018 January 21 07:07:23 »
Thanks I'll check it out.

Offline m_abukhalid

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Re: Bias Problems
« Reply #7 on: 2018 January 21 10:07:41 »
Hi... just curious.. what did you change to fix your bias frame?