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Re: ztf images and aperture photometry

Posted by karenacollins on Jul 29, 2022; 5:54pm
URL: http://astroimagej.170.s1.nabble.com/ztf-images-and-aperture-photometry-tp1918p1966.html

Hi Scott,

The underlying ImageJ currently has a limitation in that it requires all images in a stack to be the same size as the first image in the stack. We have a feature request on our to-do list to try to gracefully handle these situations by cropping larger or filling smaller images so that they are the same size as the first.

If that if you are extracting differentially photometry, you'll need of course need to ensure that all of the same comparison stars to occur in all images.

We will not be able to spend resources on this in the near term, so making sure the images are all the same size outside if AIJ is a workaround.

Another work around is to process each batch of images that are of the same size together. Then open the images that have a different and run multi-aperture on them. Keep the measurements table loaded between runs and results will be added to the bottom of the table. As I mentioned above, if you are running differential photometry, you'll need to pre-determine a set of comp stars that exist in all image sizes.

Karen