You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert
Almost all the photometric codes perform some type of sigma clip in sky annulus before calculate the sum. SExtractor also make it, but SEP miss this feature. Some background subtraction problems appear.
The text was updated successfully, but these errors were encountered:
In reality, the SExtractor sky algorithm do not include the sky annulus sum. It computes the sky value in a independent way, by the 2.5median-1.5mean value. After finish my PhD thesis in this week I can study how to implement this and create a pull request.
The SExtractor global background algorithm certianly does use the 2.5 * median - 1.5 * mean method. (As does SEP.Background, which should give identical results to SExtractor global background.) I thought the SExtractor local background annulus (which is actually a "box" annulus) does not use this, but I might be wrong.
Almost all the photometric codes perform some type of sigma clip in sky annulus before calculate the sum. SExtractor also make it, but SEP miss this feature. Some background subtraction problems appear.
The text was updated successfully, but these errors were encountered: