White points in sky background aperture ?

Posted by PieterVuylsteke on May 28, 2021; 10:23am
URL: http://astroimagej.170.s1.nabble.com/White-points-in-sky-background-aperture-tp1574.html

Hi,

While measuring sometimes some pixels become white inside of the background aperture.
In the word document one sees nicely black, and one nicely whitish.

What is the reason/algorithm for that ?

(my measurement are a bit, eum, wobbly, and it seems it is due to background variations, yes my photo's are calibrated)





Kind regards,
Pieter.