Re: Same Photometry Settings on Same Image - different results

Posted by karenacollins on Aug 08, 2019; 7:26am
URL: http://astroimagej.170.s1.nabble.com/Same-Photometry-Settings-on-Same-Image-different-results-tp1199p1200.html

Hi Cliff,

I've looked at this for a while now and can't figure out what is going wrong when loading your fits images into an existing image display window.

In fact the problem is fairly easy to see. Open the first image into a new AIJ window, and then replace that image in the same window as you described below (or just drag and drop a new image into the existing image display). Then role the mouse around and look at the peak counts in the box above the image and values from the original image will be displayed.

The confusing part is that all of the test FITS images I have open with no problem into an existing window with the pixels values reported from the new image as expected. I can however see the problem with the two images you sent. I looked at the fits headers trying to see a difference that might cause the problem, but had no luck.

The bottom line is that this must be some odd AIJ bug that I can't pin down (already spent several hours trying to debug it). I think there are a couple of ways to work around this (1) open both images as a sequence into a stack (2) work from two separate image windows (photometry on both will go into the same measurements table. Will one of those workarounds solve the problem at the moment?

What software was used to originally create the fits files. I think it is Maxim DL and Pinpoint for the plate solution, based on the header info. Is that correct?

Karen

P.S. If other AIJ users see the same problem, please let me know here. I need more sources of files to debug what is going wrong.