Flats calibration -...
 
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Flats calibration - Total Pixel count differs between BIAS corrected and DarkFlat corrected

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(@stastro)
Black Hole Moderator
Joined: 7 years ago
Posts: 257
Topic starter  

I have noticed a bizarre thing when comparing two master flats. One was created via a Master BIAS, the other was created from Master Dark Flats, but the flats source files are the same. When loading the files up in PixInsight, the Master Flat that was BIAS corrected shows the correct number of total pixels 61171488 (9576*6388), yet the DarkFlat calibrated version shows 61171486, 2 pixels less. This is the snapshot from the Statistics for each file

MasterBias Corrected:

image

And MasterDarkFrame Corrected:

image

I have since checked all the other calibrations, and all the Flats calibrated with MasterBIAS all report 61171488, the ones calibrated with MasterDarkFlats:

L: 61171486
R: 61171485
G: 61171484
B: 61174185
Ha: 61171484
OIII: 61171484
SII: 61171484

I have also noticed that the "Maximum" value of a pixel is much lower in the MasterDarkFlats calibrated flats too.

Should this be a concern?

Regards

Simon

 



   
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