iraf.net

Hi, I just installed iraf for Fedora FC20 and it worked like a charm, installing-wise. But now that I am testing the various tasks I found a problem- and very fast . After loading an image I started imexam and wanted to check the fwhm on an image I have been working with very ofter. But Now imexam gives me completely wrong pixel values. It can only detect one very bright, aka saturated star, everything else disappears in the background, so no surface profile either. A friend tested the same image on his MAC and imexam works perfectly, but in my new installation- no such luck. But no error message either. I suspect there is some seeting I am missing here, but have no idea which one. If anyone can help- thanks!

If you are using DS9 and loaded the image in DS9 manually, you might be seeing a known problem in ds9 related to cursor coordinate readback. I believe this only affected DS9 v7.2 but you might try other tests to see whether simple cursor readouts are working as expected (e.g. the 'C' command to print coordinates or just "cl\$this->_split2($m[0]) =imcur"), and if not try a different DS9 version.

Try instead to use the DISPLAY task or IMEXAM itself to load the image display first. What keystroke command were you using?

Note also that when you use IMEXAM on a frame already in DS9, you're operating on the scaled pixel value (i.e. a range of 200 values) and not the image itself. That might explain why you only see the brightest star.