Dark corrections and ccdproc

Guest wrote on Jan 21, 2009

 
I have several light images taken at different exposure times. I would like to simplify my life and take only one set of long exposure dark images and scale them to the different light image exposure times. When imaging lights, I also take a set of bias images (zero-level exposures) which I average together as Zero.fits.
 
When I use ccdproc to dark correct – for example
 
ccdproc *.fits ccdtype="object" fixpix- overscan- trim- zerocor- darkcor+ flatcor- dark=Dark.fits
 
does ccdproc remove the zero level correction from the dark before scaling? Or, does it only scale Dark.fits without subtracting the Zero.fits first? I do not need/want to apply Zero.fits to any images other than Dark.fits, and only when it is scaled down to be used for dark correcting shorter exposure times.
 
 
~Phil Nelson
 
- - - - - - - - - - - - - - - - - - - - - - - - -
Virginia Tech
Physics Department, MSC 0435
Blacksburg, VA 24060
540.231.8742
kenelso2@vt.edu ([email]kenelso2@vt.edu[/email])
 

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

---

Last post on Jan 21, 2009