# 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.
Raw data
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"description": "# ePSF Generator\n\nThis 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.\n\n\n## Usage\n\nTo run the script, use the following command:\n\n```\nepsf_generator [-h] -i IMAGE [-n NUMBER] [-f FWHM] [-s SIZE] -o OUTPUT\n```\n\n## Required Arguments\n\n\n`-i` or `--image`: path to FITS image\n\n`-o` or `--output`: path to output ePSF FITS file\n\n\n## Optional Arguments\n\n\n`-n` or `--number`: maximum number of stars to use for ePSF model (default is 100)\n\n`-f` or `--fwhm`: FWHM (full-width at half-maximum) of stars in pixels (default is 5.0)\n\n`-s` or `--size`: size of cutout in pixels around detected stars (default is 25)\n\n`-h` or `--help`: show help message and exit\n\n\n## Example\n\nCreate an ePSF from an input FITS image and save it as a FITS file:\n\n```\nepsf_generator -i input.fits -o output.fits\n```\nThis will generate an ePSF from the input.fits image with default parameters and save it as output.fits.\n",
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