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Created page with "== Overview == The QL Tool produces quick-look products, but there are some straightforward steps allowing users to use these as a starting point for their science quality re..."
== Overview ==
The QL Tool produces quick-look products, but there are some straightforward steps allowing users to use these as a starting point for their science quality reductions
=== Important Notes ===
In going from the raw 2D images to the 1D extractions produce by the QL Tool:
* The x axis is flipped so that increasing wavelength runs in the same direction as increasing x
* The spectra are then trimmed to remove overscan, etc.
The exact values for these are stored in:
/usr/local/etc/qlgui/pars.json<br />
"badMax0": 98, <br />
"badMin1": 2145, <br />
in python 0-based numbering.<br />
i.e. in python, to reproduce the same transformation:<br />
from astropy.io import fits<br />
im2D = fits.getdata('image.fits')<br />
im2D = im2D[:,-:] # flip x<br />
im2D = im2D[:,98:2145] # trim<br />
fits.writeto('outimage.fits',im2D)<br />
The QL Tool produces quick-look products, but there are some straightforward steps allowing users to use these as a starting point for their science quality reductions
=== Important Notes ===
In going from the raw 2D images to the 1D extractions produce by the QL Tool:
* The x axis is flipped so that increasing wavelength runs in the same direction as increasing x
* The spectra are then trimmed to remove overscan, etc.
The exact values for these are stored in:
/usr/local/etc/qlgui/pars.json<br />
"badMax0": 98, <br />
"badMin1": 2145, <br />
in python 0-based numbering.<br />
i.e. in python, to reproduce the same transformation:<br />
from astropy.io import fits<br />
im2D = fits.getdata('image.fits')<br />
im2D = im2D[:,-:] # flip x<br />
im2D = im2D[:,98:2145] # trim<br />
fits.writeto('outimage.fits',im2D)<br />
