[AstroPy] Image combine

Christopher Hanley chanley@gmail....
Tue Mar 6 13:11:36 CST 2012


There is a "lite" version called numcombine living in stsci.image.  It
doesn't exactly have a user friendly interface and I would definitely do it
differently if I had to do it again.  But it might be a place to start.

Chris


On Tue, Mar 6, 2012 at 2:01 PM, Kathleen Labrie <klabrie@gemini.edu> wrote:

> Hi,
>
> I think Jose mostly refer to the rejection, masking, scaling, weighing
> algorithms that iraf imcombine offers.    I agree the arithmetic is easy
> enough to do with numpy and pyfits, even the median.  It's the rest
> of imcombine that can get tricky (and bloated).
>
> For the record, here at Gemini, we will soon embark it that foolish
> adventure
> of trying to reproduce at least some of the imcombine features (but only
> the ones we need due to time and resource constraints).   We are still
> at the point of defining which features we really need though, so I don't
> think it will help Jose much for now.
>
> I am very interested to hear if someone has written some code for a
> imcombine-like routine.
>
> Cheers,
> Kathleen
>
> On Mar 6, 2012, at 8:52 AM, Erik Tollerud wrote:
>
> > I'm not aware of a function that does it exactly with the interface of
> > imcombine, but it can be done pretty easily with pyfits:
> >
> > import pyfits
> >
> > f1 = pyfits.open('filename1')
> > f2 = pyfits.open('filename2')
> >
> > h1 = f1[0].header
> > im1 = f1[0].data
> > im2 = f2[0].data
> >
> > newimage = im1 + im2
> >
> > newhdu = pyfits.PrimaryHDU(data=newimage,header=h1)
> > newhdu.writeto('newfilename')
> >
> >
> > That example is specific to addition, of course (the im1 + im2 part,
> > but it should be clear how to generalize it to other arithmetic
> > operations.
> >
> >
> > 2012/3/6 Jose Miguel Ibáñez <ppmime@gmail.com>:
> >> Hello everyone,
> >>
> >> does anyone know of an implementation of the iraf.imcombine task in
> >> python+numpy ? (of course, not using pyraf.imcombine call)
> >>
> >>
> >> Thanks !
> >> Jose
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> >
> >
> >
> > --
> > Erik Tollerud
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