dividing flats by flats with ccdproc

Guest wrote on Sep 14, 2007

Hi, I am trying to use ccdproc to flatten a twilight skyflat. The
skyflat is a combined
image of 3 twilight spectra, and the flat is a quartz lamp flatfield,
corrected for the
detector response. In the IRAF tutorial, it says to issue the command
ccdproc Sky flatcor+ flat="nQuartz", but when I do that, nothing
happens.

I suppose I can just use imarith, but do you have any idea why this
isn't working?

Thanks,

Julia Kennefick (currently observing at the 2.1m at KPNO).

Post generated using Mail2Forum (http://www.mail2forum.com)

---

Ivan Ramirez wrote on Sep 14, 2007

By default ccdproc operates on 'object' images, did you change the "ccdtype" parameter in ccdproc? You can try:
ccdproc Sky flatcor+ ccdtype="flat" flat="nQuartz"

---

Last post on Sep 14, 2007