RE: fun with co-adding images on Disk Set 19

[Chris Albertson <chrisalbertson90278@yahoo.com>]

Don't quite get your question.

But yes you want to first make a user called "iraf"
and do the install as that user.  Not as root although
you do need to be "root" to do some of the install, for
example writting into /usr/local/bin

--- "Creager, Robert S" <CreagRS@LOUISVILLE.STORTEK.COM> wrote:
> 
> Fine words of wisdom.  I guess I really need to re-install IRAF and
> attempt
> to hurdle the learning curve...  Chris did have a good idea a while
> ago,
> using a unique user for the install.
> 
> Thanks,
> Rob
> 
> 
> > -----Original Message-----
> > From: aah@nofs.navy.mil [mailto:aah@nofs.navy.mil]
> > Sent: Tuesday, October 16, 2001 3:00 PM
> > To: tass@listserv.wwa.com
> > Subject: RE: fun with co-adding images on Disk Set 19
> > 
> > 
> > Rob,
> >   Your technique of matching stars, then coadding, is what
> > most image processing packages do (such as the nice iraf
> > package immatch).
> >   One thing you need to watch for is that an incorrect
> > polar alignment not only causes drift on the CCD, but also
> > rotation.  I had to rotate as well as translate all of my
> > images that made up the M31 composite.  In addition, you
> > want partial-pixel alignment, which means you have to decide
> > what algorithm you want to use for interpolation.  I'd
> > recommend looking at how iraf does it (imshift is the
> > appropriate routine).  Personally, this is a lot of work
> > and I'd rather use a standard image processing package to
> > do such reductions than to roll my own.
> > Arne
> > 
> 


=====
Chris Albertson 
  Home:   310-376-1029  chrisalbertson90278@yahoo.com
  Cell:   310-990-7550
  Office: 310-336-5189  Christopher.J.Albertson@aero.org

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