Re-performing multi-aperture measurement with same apertures

Posted by thisisdogastronomer on Jan 12, 2018; 12:54pm
URL: http://astroimagej.170.s1.nabble.com/Re-performing-multi-aperture-measurement-with-same-apertures-tp953.html

Hello AIJ forum,

I'm currently working on a stack of data on which I want to try several settings for the aperture(s) to reduce errors of both the target and the comparison star(s) flux. To be able to actually make the outcome comparable, I need to use the exact same aperture locations on every run. I know that there's a checkbox which says "use previous x apertures (1-click to set first aperture location)", but what I really want is that ALL the apertures are being placed at their previous positions. As I will always have to set the target aperture on my own, I can't be sure that it's exactly the same location (in pixels e.g.) where I placed it in the previous measurement. Is there a way to do this?

I could try looking at the ImageJ X/Y or FITS X/Y but since it's given till the 4th decimal digit that's probably too much effort if I wanted to perform numerous measurements.

Thanks in advance.

Regards,
Fabian