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Normal Topic
Interactive review of CCD framesStarted by:pskoda, 01/22/2007 11:17PM
Hi all,

Before any reduction of CCD frames it is
usually necessary to check the quality
of frames and its image type (e.g. not
to do flatcombine when the flat is
overexposed or if it is in fact the arc
exposure with wrong header...).
Sometimes more det... 		 
3862 3
By: fitz
01/22/2007 11:17PM
Normal Topic
artdata.mknoise task gives low values...Started by:karsten brogaard, 01/26/2007 02:39PM
Hi,

I have tried to use the task
artdata.mknoise to add poisson noise to
my images. But for all pixels which are
saturated in the original images (value
= 65535) I get very low values
(~10-100)? Why is that?

Karsten 		 
3935 3
By: fitz
01/26/2007 02:39PM
Normal Topic
Problem with gemini.niri.nprepareStarted by:kiva, 02/02/2007 06:59PM
Hi,

I'm new to reducing Gemini data and am
having problems with the task nprepare
in the gemini.niri package. I'm using
PyRAF 2.1 on Mac OS Tiger.

I've left the task parameters to their
default values and provided a list of
calibration frames as input... 		 
2866 2
By: kiva
02/02/2007 06:59PM
Normal Topic
guiapps segmentation violation on macosxStarted by:sirmarcos, 02/05/2007 07:10PM
Hello,

I tried the pre-compiled binaries of
guiapps for macosx (ppc) today and all
guiapps programs produced a segmentation
violation. So, I then tried to rebuild
them binaries from the source and
several errors occured, and no
x_spectool.e gets creat... 		 
4528 4
By: sirmarcos
02/05/2007 07:10PM
Normal Topic
photometry prereduction scriptStarted by:FSBoyden, 02/06/2007 07:06AM
Hi all

Hope you all had a happy new year? :D

I am trying to put together a photometry
pipeline for the Boyden Observatory. The
package currently contains scripts to
fix the fits headers, to do the batch
photometry using daophot, and to dump
the neces... 		 
17427 19
By: FSBoyden
02/06/2007 07:06AM
Normal Topic
`hedit` problem in new IRAF installationStarted by:Hooloovoo, 02/06/2007 12:51PM
Hi,
I am running a difference image
reduction pipeline that uses
IRAF/DaoPhot for the initial photometry
on the images as well as header editing
etc. Everything works fine on the old
machine that I was running it on but I
recently transferred the codes... 		 
3646 3
By: fitz
02/06/2007 12:51PM
Normal Topic
imexpr file name parsing problemsStarted by:dougmink, 02/06/2007 09:16PM
This is either a shell bug or an imexpr
bug. When you give imexpr a command
such as the following:

im > imexpr "a-b" out.fits a.fits
b.fits

it fails with the message

Error: bad image parameter reference
b.fits

but

im > imexpr "a-b" out.fits ... 		 
3346 2
By: dougmink
02/06/2007 09:16PM
Normal Topic
imcombine error: Attempt to READ out ...Started by:rrg, 02/13/2007 01:27AM
Hi all,
I am using imcombine to try to combine
multiple very large images, using the
image WCS information (offsets=wcs). It
successfully calculates the offsets, but
fails during the combine operation with
ERROR: Attempt to read out of bounds on
file ... 		 
2402 1
By: fitz
02/13/2007 01:27AM
Normal Topic
fxcor: units in saved cross-correlationStarted by:cmaceroni, 02/13/2007 10:43AM
Hi Mike,
I have met another problem with fxcor.
The same as in the old 2003 topic in the
subject, i.e. when I s-plot the saved
ccfs I get a shift in the image of about
1200km/s.
I have found the old post with the
explanation of the reason and I checked
... 		 
2877 2
By: cmaceroni
02/13/2007 10:43AM
Normal Topic
preserving WCS info while using imcopyStarted by:rawat, 02/14/2007 07:40AM
Hi all,
does anybody know whether the WCS
information of the original image is
preserved while using imcopy to carve
out a section of the original image? Eg.
If I have a 2048*2048 image with full
WCS solution present in the header of
the fits file, and ... 		 
4123 3
By: valdes
02/14/2007 07:40AM
Normal Topic
How to add a constant value to pixels...Started by:jhargis, 02/19/2007 11:34PM
All -
I'm sure this is a relatively simple
question. I would like to know how to
implement the following on my images:

If any pixel value on the images is less
than zero, then add constant value (say
65,535 for example).

Thanks,
Jonathan Hargis

(The... 		 
3470 3
By: fitz
02/19/2007 11:34PM
Normal Topic
imred fibresponse problemStarted by:Guest, 02/21/2007 08:45PM
Dear Sir, Madam,

When running dohydra, it aborts saying
SyntaxError: Error in CL script
/usr/stsci/iraf/noao/imred/src/fibers/fibresponse.cl
Duplicate keyword 'ansrecenter' in call
to apscript (line 113)
Duplicate keyword 'ansrecenter' in call
to apsc... 		 
2435 2
By: Jon1234
02/21/2007 08:45PM
Normal Topic
ctio 4m ccd for echelle spectroscopyStarted by:Guest, 02/21/2007 09:28PM
Dear IRAF Help Desk,

I am trying to reduce CTIO-4m/echelle
data, but can't
find any IRAF task to do so in ctio
package.
The chip has two amplifiers, therefore
two trim sections
and two bias sections. I can't use
ccdproc for this
dataset. Is there any... 		 
2839 2
By: fitz
02/21/2007 09:28PM
Normal Topic
task parameter string problemsStarted by:dougmink, 02/22/2007 10:16PM
Is there a maximum length for strings as
parameter values in tasks?
We have a list of file names which seems
to be too long for epar, dpar, and lpar.
The value can be set on the command
line, and the task uses all of the files
on the list, but when you ... 		 
3800 3
By: fitz
02/22/2007 10:16PM
Normal Topic
XDIMSUM + external object maksStarted by:vall, 02/23/2007 05:52PM
Hello,

Is there a way to use external object
masks with XDIMSUM? I will be reducing
data of a field for which I already have
a deep image. The idea is from the deep
image to create an accurate object mask.
When the new images are obtained, the
mask wil... 		 
2494 1
By: valdes
02/23/2007 05:52PM
Normal Topic
IRAF / IDL interaction?Started by:vall, 02/23/2007 06:01PM
Hello

Not exactly IRAF question, but
anywhere.... Does anybody know if there
is IDL procedure that can read the IRAF
spectral WCSs - multispec, etc.? I wrote
one myself but it has not been tested
extensively and I was wondering if there
is something es... 		 
4367 2
By: vall
02/23/2007 06:01PM
Normal Topic
mscimage errorStarted by:joshw, 02/23/2007 10:07PM
I'm trying to use mscimage on single
extension images to project each file
onto a common projection. However, I'm
getting the error:

ms> mscimage @list_Perseus_H2
@list_Perseus_H2_rescaled
wcssource=parameters rotation=0
scale=1.0 ra=3:29:02 dec=31... 		 
5974 5
By: valdes
02/23/2007 10:07PM
Normal Topic
How to caluclate flux in continuum re...Started by:Ana2007, 03/05/2007 01:35PM
Hello,

I would like to calculate the flux in a
continuum region of a spectrum but I
cannot find out how. For my analysis I
need to measure the quotient of the flux
in an emission line (is OK) and the flux
in a close by continuum region. I use
"splot" ... 		 
2882 2
By: Ana2007
03/05/2007 01:35PM
Normal Topic
mscimage boundary interpolationStarted by:Rach, 03/06/2007 12:53AM
I'm trying to convert MEFs into single
images with mscimage. It works well
except the task interpolates badly (and
unnecessarily) at the edges of the
image. I've tried adjusting the ntrim,
boundary and interpolant parameters to
no avail.

Is there a... 		 
2204 1
By: valdes
03/06/2007 12:53AM
Normal Topic
Task GAUSS: sigma parameterStarted by:Acrobat, 03/08/2007 01:21PM
Hi all,

I have to use the task GAUSS to perform
a convolution. My question is: how can I
pass from my instrumental resolution
(expressed as lambda/Dlambda or as
velocity) to the parameter sigma for the
gaussian, in pixels?

Many thanks in advance.

Che... 		 
5434 2
By: Acrobat
03/08/2007 01:21PM
Normal Topic
executing IRAF commands from the promptStarted by:Hooloovoo, 03/09/2007 11:32AM
Is there a way to do this without having
to go in the IRAF environment? 		 
2111 1
By: fitz
03/09/2007 11:32AM
Normal Topic
allstar - daoparsStarted by:ping, 03/09/2007 10:50PM
Hello,

When I run digiphot/daophot/allstar, I
have to set the daopars with
(recente= yes) Recenter
stars during fit ?

If I set (recente=no), many of them will
not come out in the als.1 file. They
will be rejected and end up in the ar... 		 
2846 2
By: ping
03/09/2007 10:50PM
Normal Topic
yet another wregister questionStarted by:aoxsic, 03/13/2007 06:36PM
Hello!

First, some background:
I'm writing a reduction script(optical
and near IR dithered data,
non-interactive) that should be pretty
automatic and robust. I've come across
images who have no WCS in their headers.
I could use xregister to align thos... 		 
3630 3
By: aoxsic
03/13/2007 06:36PM
Normal Topic
block sum or float binningStarted by:azastro, 03/14/2007 04:20PM
Hi, all!

I have image with scale 0.05"/pix(HST
image).
And want make image with
scale 0.33"/pix (VIMOS IFU mode).

How to compute new image.
"BLKAVR" not useful because
I need float block sum (0.05->0.33 ==
1:6.6).

Please help. 		 
2820 2
By: azastro
03/14/2007 04:20PM
Normal Topic
Error in header of echelle/dispcor sp...Started by:dr.michi, 03/15/2007 12:42PM
I noticed, that whenever I have two
calibration frames, the wavelength
calibration string in the header gets
mixed up a bit: There is no space
between the function describing the
frist calibration frame and the second
one.

Example
spec1 = "1 51 2 11090... 		 
3453 2
By: dr.michi
03/15/2007 12:42PM
Normal Topic
Rotation and flipping image of spectrumStarted by:pskoda, 03/15/2007 06:34PM
Hello,

I have problems with simple rotation and
flipping 2D image of spectrum followed
by apall and identify. What I want is
to physically rotate and/or flip image
by changing the pixels contents not just
transformation matrix keywords. The
problem ca... 		 
5314 2
By: pskoda
03/15/2007 06:34PM
Normal Topic
fxcor double precisionStarted by:orsola, 03/15/2007 08:12PM
I found some old e-mail advice on using
fxcor which indicated that the fxcor
within IRAF is not good enough and one
should mail Mike Fitzpatrick about
getting the double precision package. Is
this so? I have a version of fxcor in my
newly installed iraf... 		 
4199 5
By: fitz
03/15/2007 08:12PM
Normal Topic
mkimsets questionStarted by:aoxsic, 03/17/2007 05:06PM
I have now tried to run mkimsets with
every possible combination of
"idfilters" I can think of.

I always get the following warnings and
an empty output file

<Warning>: Image li100108.fits
filter id 2 B#74 does not belong to the
filter set U#7 ... 		 
3652 3
By: aoxsic
03/17/2007 05:06PM
Normal Topic
headers fixStarted by:iraf_user, 03/20/2007 06:48PM
Hello,

I am trying to read some headers and the
problem is that for some reason
the header information has been stored
in an agle.
When I use imhead, it looks something
like this:
----------------------------------------------------------------------
... 		 
2463 1
By: fitz
03/20/2007 06:48PM
Normal Topic
fxcor relative velocitiesStarted by:swortel, 03/22/2007 06:29PM
Hi,

I've used dopcor to shift a spectrum by
a velocity in km/s. Then I've been
trying to measure that shift by using
fxcor with the newly shifted spectrum as
object and the original non-shifted
spectrum as template. My assumption is
that the vrel (or... 		 
6093 5
By: fitz
03/22/2007 06:29PM
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