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[gnuastro-devel] [task #14421] Make PSF profiles without catalog
From: |
Mohammad Akhlaghi |
Subject: |
[gnuastro-devel] [task #14421] Make PSF profiles without catalog |
Date: |
Fri, 24 Mar 2017 11:28:16 -0400 (EDT) |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0 |
URL:
<http://savannah.gnu.org/task/?14421>
Summary: Make PSF profiles without catalog
Project: GNU Astronomy Utilities
Submitted by: makhlaghi
Submitted on: Sat 25 Mar 2017 12:28:15 AM JST
Should Start On: Sat 25 Mar 2017 12:00:00 AM JST
Should be Finished on: Sat 25 Mar 2017 12:00:00 AM JST
Category: MakeProfiles
Priority: 5 - Normal
Item Group: Enhancement
Status: Postponed
Privacy: Public
Percent Complete: 0%
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Effort: 0.00
_______________________________________________________
Details:
Currently MakeProfiles needs a catalog as input for profile parameters, the
reason is that multiple parameters are needed to define a generic profile.
But a PSF, or convolution kernel, isn't a generic profile and is highly
constrained: for example its center is fixed (the center of the central
pixel), the image size is also dependent on the truncation radius, and its
total sum of values has to be one. So, the only parameters necessary are the
radial function, its FWHM, and its truncation radius.
Making a kernel (for convolution) is necessary for several Gnuastro programs
and it is inconvenient to make a catalog every time you need a single kernel.
So we can add an option (called `--kernel' maybe) to MakeProfiles to only make
one PSF with a command like this:
$ astmkprof --kernel=gaussian,3,5 # FWHM, Truncation
$ astmkprof --kernel=moffat,3,2.8,5 # FWHM, Beta, Truncation
With this feature the current behavior (where Gaussian and Moffat profiles get
built individually and not on the merged image along with the Sersic profiles
for example) can be removed.
Please share your thoughts if you have any ideas to make this better before it
is implemented.
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