Re: Multi-Plot Problem during Multi-Aperture process

Posted by wvinton on Mar 19, 2014; 3:13pm
URL: http://astroimagej.170.s1.nabble.com/Multi-Plot-Problem-during-Multi-Aperture-process-tp136p146.html

Karen: To answer your final question - the image disappeared just as soon as I clicked on the multi-aperture icon.

Reinstalling the AstroImageJ solved the disappearing image problem - seems to work as if nothing happened.

Changing the bin to 1 resulted in all the points appearing on the graph (I guess I was interpreting  "bin" to refer to how the images had been taken).

The graph still only shows the target star plot. I'm attaching screen shots of the various windows so that you can see what's going on! (All of the relative flux measurements for the comp stars in the Measurements table are well below 1.0.)

I'm also attaching the error window that showed up as previously described - when the multi-aperture icon was clicked on AIJ toolbar during the era of disappearing images (it doesn't show up now that I reinstalled AstroImageJ and things are working fine).

And, thanks for the update on not needing alignment stars if WCS headers are present!

Thanks so much!

On Wed, Mar 19, 2014 at 12:36 AM, karenacollins [via AstroImageJ] <[hidden email]> wrote:

Hi Bill,
One note first: the image you posted didn't seem to come through the forum. Could you either try again or send it to me directly at karen dot Collins at insightbb dot com.

Let me comment on a couple of items to see if that resolves two things you mentioned. If you have 9 images and only 5 dots are plotted on the screen, it may be that you having "binning" set to 2 for that light curve. Check here on the Multi-plot Y-data panel and make sure you have a 1 on the plot line in question:


Also, for light curves you want to show on the plot, make sure the "Plot" checkbox is enabled on that line as shown for data sets 1, 2 and 4 above. Also, if you are using "Auto Y-range" (circled below) to set the y-axis scaling, make sure the  "Auto Scale" check boxes above are enabled for the lines you want to plot.



Alignment issue: the daily build of 2.1.5 has a new alignment mode available if your images have WCS headers. In that mode, you do not need to identify stars. The alignment will start automatically as you described and the images will be aligned according to the information in the headers. Can you check and made sure the option circled below is disabled? If it is disabled, then alignment will required object apertures to be defined as before. This option will only show up if the first image in your stack contains valid WCS headers.



I'm still trying to think about what could be going wrong with the images disappearing. I will write back separately on that issue. I don't think aligning the images using standard IJ would have caused the problems you are seeing, but could you try updating AIJ to the "daily build" again to see if the images stop disappearing and if the error message you posted goes away? If this fixes the problem, then there may indeed be something happening between the AIJ and IJ installations that is causing a problem, as you suggeseted.

Just be be sure, your basic IJ and your AIJ installations are in different folders on your system? I think that would happen automatically on a Mac.

One final comment. If your images have WCS headers, there is no need to align your images to run Multi-aperture in db2.1.5. There is a new option that you can enable in the Multi-Aperture setup screen that tells AIJ to use the WCS header information to find the apertures in within your images, even if they are not aligned. However, I realize there are other reasons you would want to align your images.

Also,

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