Welcome to iraf.net Friday, May 17 2024 @ 06:25 AM GMT

 Forum Index > Help Desk > Applications New Topic
First | Previous | 8 9 10 11 12 13 14 | Next | Last
 
Topic Subject
 		 Views
 		 Replies
 		 Last Post
 
Normal Topic
RMS value seem strange in telluricStarted by:fitz, 07/29/2016 03:33PM
[color=red][Moderator's Note: Posted
from submitted story on behalf of
user.][/color]

I am analyzing high-resolution
near-infrared spectra retrived with our
original spectrograph WINERED installed
on a 1.3-m telescope at Kyoto Sangyo
University.

... 		 
1464 1
By: valdes
04/25/2017 10:22PM
Normal Topic
rmfringe,irmfringeStarted by:cody, 04/28/2008 11:26PM
Hi,
I'm having problems removing fringes
from my images. I have done all the
standard procedures, including removing
the background on scales larger than the
fringes and masking out the objects. I
made a fringe flat from a large number
of images (60), ... 		 
6848 6
By: gail
04/28/2008 11:26PM
Normal Topic
rgbsun troubleStarted by:AndrewS, 10/23/2010 01:54PM
Hi all

I'm having trouble making an rgbcolour
image with rgbsun..
First thing is I have three images: _I
,_V and _B filters but when I try
rgbsun I am told that images must all
be of the same size.. images differ by
at most one pixel for given dimen... 		 
1398 1
By: fitz
10/23/2010 01:54PM
Normal Topic
Rfits task questionStarted by:Gaba_p, 07/08/2009 02:53PM
Hi,

this is a very simple question. I have a
*.fits file about 63Mb. After I run
rfits on that file (with 'datatype =
ushort') I get apparently exactly the
same image file, except this new file is
exactly half the size of the original
one.
I've read th... 		 
2501 3
By: fitz
07/08/2009 02:53PM
Normal Topic
rfitsStarted by:Guest, 11/17/2005 06:22PM
 Dear Mr. Phillip,

Its been long time we haven't get in
touch.Hope you still remember me.
[img:f2b5c14464]http://us.i1.yimg.com/us.yimg.com/i/mesg/tsmileys2/04.gif[/img:f2b5c14464]
I have a few questions here:
1. Why there is a big different ... 		 
4826 2
By: zarate
11/17/2005 06:22PM
Normal Topic
Restricting range in dohydraStarted by:ngosnell, 08/17/2009 03:37PM
I am trying to find the wavelength
solution for a set of echelle data using
dohydra. Ideally, I would like to fit
lines to all but the bluest 20 angstroms
of my spectral range. Is there any way
of setting a limited range in the
dohydra step without ac... 		 
1443 1
By: fitz
08/17/2009 03:37PM
Normal Topic
Resetting CRVAL1 after scopyStarted by:stockton, 02/09/2013 01:26AM
scopy retains the original value of
CRVAL1 after extracting a subregion of a
spectrum, providing a pixel offset
(CRPIX1) to compensate for the
wavelength difference. I need to feed
these spectra into an application that
depends on having a value of CRVA... 		 
1128 0
By: stockton
02/09/2013 01:26AM
Normal Topic
Request for more splot input validati...Started by:Jason Quinn, 02/15/2011 02:55PM
Splot seems to do only very weak
validation of input for the "line" and
"band" parameters. In particular, the
user can enter values that far exceed
the actual upper limit for line or band
for a given image. Could this be
improved? Is there a reason why ... 		 
1318 1
By: valdes
02/15/2011 02:55PM
Normal Topic
request for advice...Started by:Michael, 09/10/2007 11:09AM
Sumner, New Zealand

2007 September 10

IRAF Support
iraf@noao.edu

Dear Sir:

I am writing to request help with two
problems that I have encountered using
IRAF:

o I am unable to use a median .fts flat
created with... 		 
3062 1
By: fitz
09/10/2007 11:09AM
Normal Topic
Replacing obsolete 'pappend' taskStarted by:Gaba_p, 04/02/2009 05:50PM
Hi,

I'm following Massey 's 'A User's Guide
to CCD Reductions with IRAF' (1997), and
when I get to page 56 it says I should
use the obsolete task 'pappend'. My
question is: which task replaces this
old one (in the way it's used in the
guide), 'tmerge' ... 		 
3137 4
By: fitz
04/02/2009 05:50PM
Normal Topic
Replacing cosmic raysStarted by:maineguy, 02/09/2011 05:14PM
I'm trying to add two images while
removing cosmic rays in the process. If
I use crreject in imcombine in IMAGES
the pixels in the final image will only
have half the pixel value as the
surrounding pixels if there was a cosmic
ray in one of the images ... 		 
1540 1
By: maineguy
02/09/2011 05:14PM
Normal Topic
Removing Saturated StarsStarted by:sbursic, 07/07/2009 04:09PM
Hello,
I am working on producing catalogs, but
I first need to remove cosmic ray hits
and over saturated stars from the
images. I found one task in crutil that
is supposed to remove cosmic ray hits
(cosmicrays), but it doesn't seem to
work. (Output imag... 		 
2679 3
By: sbursic
07/07/2009 04:09PM
Normal Topic
Removing one aperture using scopyStarted by:rohit, 08/27/2009 04:52PM
Incidently while searching the forum, I
found a question similar to one I
answered. However this is slightly
different.

I have echelle spectrum of a target with
11 apertures. I would like to remove the
last aperture from the spectrum. How
would I do t... 		 
2051 2
By: rohit
08/27/2009 04:52PM
Normal Topic
Rejecting neighbors in crowded star f...Started by:Guest, 10/11/2005 02:35PM
On Thu, 29 Sep 2005 10:30:38 -0700
Steve Asztalos
<asztalos1@llnl.gov> wrote:

>
> Hi,
>
> I've been running IRAF on some
Gemini South image data taken in the
> R-band in May 20005. I'm interested
in weak lensing and hence require... 		 
3003 0
By: Guest
10/11/2005 02:35PM
Normal Topic
reidentify: poor features centering i...Started by:vall, 02/06/2008 07:44PM
Hello,

I am reducing a large number of spectra
with the same set-up. I am using
reidentify in non-interactive mode to do
the wavelength solutions. It works fine
but I was not very happy with the RMS I
get. Then I noticed that some features
were obviou... 		 
1968 1
By: vall
02/06/2008 07:44PM
Normal Topic
reidentify. select if rms less than s...Started by:azastro, 05/01/2007 02:35PM
Hi Iraf users!

I start
[b:7a99b03a25]xgterm[/b:7a99b03a25] and
then [b:7a99b03a25]pyraf[/b:7a99b03a25].

I identify lines on He-Ne-Ar lamp
exposure
for middle line of spectra(count=23,
rms=0.15).
Than I want reidentify dispersion
solution
for other pa... 		 
2964 2
By: azastro
05/01/2007 02:35PM
Normal Topic
Reidentify with two reference imagesStarted by:mshea, 02/07/2023 10:03PM
Hi all,
Is there a way to use two reference
images in reidentify?

I currently have two comparison lamps,
Neon and Krypton. Neon calibrates the
data well in the red but does poorly in
the blue, while Krypton is the opposite.
Due to differences in e... 		 
1589 1
By: valdes
02/09/2023 05:18PM
Normal Topic
Reidentify can't open id file in data...Started by:malte, 03/14/2008 06:47PM
I'm trying to revise a wavelength
calibration I did a few years ago. I've
copied both data and database from cd to
disk, and tried to run reidentify. It
allows me to fit one line, then tells me
it can't open the id file in the
database.

As far as I... 		 
2481 1
By: malte
03/14/2008 06:47PM
Normal Topic
reidentify - why does it find bogus l...Started by:gfuresz, 06/06/2006 06:24PM
Hi,

I try to use reidentify in the specred
package to automatically identify ThAr
emission lines based on a
"master-reference" file. I have to do it
this way since the MOS image has 240
spectra in it, with a zig-zag pattern
wavelength shift between ape... 		 
2757 1
By: valdes
06/06/2006 06:24PM
Normal Topic
Registering ImagesStarted by:Hooloovoo, 05/30/2006 10:57AM
Hi,

I need to align several *.fits frames
from a single telescope and then stack
them. The problem is that there are
small rotations from frame to frame so I
cannot use
[color=blue:34a91f3caf]imalign[/color:34a91f3caf].
I attempted to use [color=blue... 		 
5553 6
By: Hooloovoo
05/30/2006 10:57AM
Normal Topic
Register a very large datacube ?Started by:bs_nuig, 05/29/2007 04:05PM
Hi,

I am trying to register a large data
cube; number of images(512x512) = 1000
or upwards. I have tested "xregister"
but as the help pages say, it will only
accept 1D or 2D images.. Similarly with
"imalign" ..

I could slice the data cube up using
"im... 		 
4370 3
By: bs_nuig
05/29/2007 04:05PM
Normal Topic
refspecStarted by:tomph, 03/24/2008 02:26PM
heya
I have created a single refence spectrum
from a rubidium lamp and am trying to
use refspec using this spectrum and a
raw image spectrum of betelgeuse.

I have seen that the sort and group
parameters needed to be set to none and
have done so accor... 		 
3655 3
By: tomph
03/24/2008 02:26PM
Normal Topic
Reducing OSIRIS/GTC data with irafStarted by:jadiazt, 10/01/2014 12:48AM
Hello,

I want to reduce OSIRIS/GTC data using
standard routines of IRAF. OSIRIS images
are composed of 3 layers, where the
first is the header and the reamaining
are the CCDs data. When I want to apply
ccdproc to the images, for example
images=image[... 		 
1949 2
By: jadiazt
10/16/2014 11:38PM
Normal Topic
redshift with fxcorStarted by:Tino, 02/09/2008 03:25AM
Hi,
I'm trying to use fxcor to get
redshifts. I tried a very simple test at
the beginning: took my template ,
redshifted it by 0.9 (using dopcor) and
then ran fxcor of this redshifted object
against the template. The answer should
be a clear peak at 0.... 		 
2835 4
By: Tino
02/09/2008 03:25AM
Normal Topic
Recommended tweaks for combine and im...Started by:Jason Quinn, 11/19/2009 03:35PM
Couple of recommended help file tweaks
for [b:91155dba83]combine[/b:91155dba83]
and
[b:91155dba83]imcombine[/b:91155dba83].

1) When scaling by exposure,
[b:91155dba83]combine[/b:91155dba83]
seems to scale relative to the
[i:91155dba83]average[/i:91155d... 		 
2200 1
By: fitz
11/19/2009 03:35PM
Normal Topic
Rebinning echelle spectraStarted by:, 05/29/2006 09:19AM
Is it possible within IRAF to rebin
spectra by a factor of 2 (to obtain
better S/N) rather than to a specific
dispersion value? I see dispcor can be
used to set a new value of 'wavelength
value per pixel', but as the dispersion
of echelle spectra vary w... 		 
2707 1
By: valdes
05/29/2006 09:19AM
Normal Topic
reading very old iraf filesStarted by:Guest, 10/01/2010 09:18PM
Hello,
I am trawling through some very old 1-D
spectral data in the old iraf
format (.imh) that I have not looked at
for years.

I am finding that files generated in the
mid 90s, e.g. 1994,1995 cannot
be read by iraf tasks - at least not
those I have... 		 
1055 1
By: fitz
10/01/2010 09:18PM
Normal Topic
reading fits errorsStarted by:dbrenner, 12/16/2008 06:31PM
ds 9 opens a multiple extension fits
file but iraf can't read it. !!?

ERROR: FXF: EOF encountered while
reading FITS file

code : magnify ( input =
filename//"["//str(J)//"]", ...

help
thanks 		 
2828 4
By: fitz
12/16/2008 06:31PM
Normal Topic
read noise and gain in APALLStarted by:owen, 04/15/2008 05:00PM
Hi, in APALL task, there are two
parameters named "readnoise" and "gain".
Does anyone know the "readnoise" and
"gain" play what role when extracting
spectrum using APALL task? Different
values of them make shape of extracted
spectra quite different. So ... 		 
2672 1
By: valdes
04/15/2008 05:00PM
Normal Topic
read & write in fileStarted by:ranisb, 12/02/2008 11:55AM
Hi,
I am writing following procedure
script.I have 3 science frames and one
masterbias.this script will subtract
biasmaster from each science frame and
change file name "sci_bs_%d.fits and
save in file 'objfile'.
The script is as following;
procedure tr... 		 
4509 8
By: jturner
12/02/2008 11:55AM
First | Previous | 8 9 10 11 12 13 14 | Next | Last

Normal Topic Normal Topic
Sticky Topic Sticky Topic
Locked Topic Locked Topic
New Post New Post
Sticky Topic W/ New Post Sticky Topic W/ New Post
Locked Topic W/ New Post Locked Topic W/ New Post
View Anonymous Posts 
Anonymous users can post 
Filtered HTML Allowed 
Censored Content 
dog allergies remedies cialis 20 mg chilblain remedies
Privacy Policy
Terms of Use

Forum Menu

User Functions

Login
Don't have an account yet? Sign up as a New User
Lost your password?

Topics