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Re: Re-performing multi-aperture measurement with same apertures

Posted by karenacollins on Jan 14, 2018; 12:11pm
URL: http://astroimagej.170.s1.nabble.com/Re-performing-multi-aperture-measurement-with-same-apertures-tp953p958.html

One more note: I original said to either enable or disable centroid on the first photometry run, depending on your needs. However, after thinking about it more, you can enable centroid on the first run when you define the apertures, but before starting the run, you will need to turn off centroid for each individual aperture by alt-left-clicking in each aperture (and making sure the "plus" sign in the middle of each aperture is no longer present). If you follow this approach, centroid would fine-tune your aperture locations near where you click, but the alt-left-click in each of the apertures after placing them will keep them from moving throughout the stack during the first photometry run.

If you place the apertures strictly by hand in the first run (i.e. with centroid disabled), then of course you don't need to worry about the above.

Karen