Best procedure to calibrate dark, flats, image, ...

[Julien]

Hi,

After having read this post from Juan : https://pixinsight.com/forum/index.php?topic=3286.msg22596#msg22596
I try to figure out what is the best procedure to calibrate flat/images.

As I understand there are three ways :

1.
- Integration of the darks (so the MasterDark contains bias).
- calibration of flats/images (with activation of the "Calibration" box)

According to Juan's post, it's the most usual procedure
 

2.
- Integration of the darks (so the MasterDark contains bias).
- calibration of the MasterDark with the MasterBias
- calibration of the flats (without activation of the "Calibration" box)

3.
- calibration of the darks with the MasterBias
- calibration of the flats with MasterDark and MasterBias (without activation of the "Calibration" box)

This method is atypical (according to Juan's post).


But for years I have been using this 3rd procedure.
Is there a difference in the result of each procedure ? Is one or other best suited for a kind of sensor DSLR, CCD, ... ?


Regards,

[bulrichl]

Hi Julien,

please see https://pixinsight.com/forum/index.php?topic=11968 . I explained it in chapter 4.

Bernd

[drmikevt]

http://www.pixinsight.com/tutorials/master-frames/index.html

[Julien]

Hi Julien,

please see https://pixinsight.com/forum/index.php?topic=11968 . I explained it in chapter 4.

Bernd

GREAT !!! This topic should be pinned at the top of the forum. Many thanks

[Scooot]

This source, (which many people use) at the bottom of bulrichl's topic

"[5] Kayron Mercieca, "2. Generating a Master Superbias and a Master Dark" and "4. Calibrating Lights and Correcting Hot and Cold Pixels"
http://www.lightvortexastronomy.com/tutorial-pre-processing-calibrating-and-stacking-images-in-pixinsight.html#Section2"

suggests calibrating the Darks with the master bias before creating a master dark, which now seems to be a big No No