ePSF Generator

This script generates an ePSF (effective Point Spread Function) from a FITS image by detecting stars, extracting cutouts, and building a PSF model. The output is saved as a FITS file.

Usage

To run the script, use the following command:

epsf_generator [-h] -i IMAGE [-n NUMBER] [-f FWHM] [-s SIZE] -o OUTPUT

Required Arguments

-i or --image: path to FITS image

-o or --output: path to output ePSF FITS file

Optional Arguments

-n or --number: maximum number of stars to use for ePSF model (default is 100)

-f or --fwhm: FWHM (full-width at half-maximum) of stars in pixels (default is 5.0)

-s or --size: size of cutout in pixels around detected stars (default is 25)

-h or --help: show help message and exit

Example

Create an ePSF from an input FITS image and save it as a FITS file:

epsf_generator -i input.fits -o output.fits

This will generate an ePSF from the input.fits image with default parameters and save it as output.fits.