Re: White points in sky background aperture ?
Posted by karenacollins on May 29, 2021; 4:55am
URL: http://astroimagej.170.s1.nabble.com/White-points-in-sky-background-aperture-tp1574p1575.html
Hi,
You have the option enabled to mark pixels that are by default ignored by the background calculation routine. To disable that display, go to Image_Display => Preferences => "Mark pixels > 2 sigma from the mean". Marking the pixels is more for debugging purposes and slows down photometry, so the option should normally be disabled.
Karen
URL: http://astroimagej.170.s1.nabble.com/White-points-in-sky-background-aperture-tp1574p1575.html
Hi,
You have the option enabled to mark pixels that are by default ignored by the background calculation routine. To disable that display, go to Image_Display => Preferences => "Mark pixels > 2 sigma from the mean". Marking the pixels is more for debugging purposes and slows down photometry, so the option should normally be disabled.
Karen
On 5/28/2021 6:23 AM, PieterVuylsteke
[via AstroImageJ] wrote:
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.
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