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Dark

Overview

This file describes the data model for the Dark image. This is written to disk as a multi-extension FITS file prefixed by Dark in the Calibrations/ folder.

This is generally a simple combination of all input dark frames.

Inspecting

The first extension is the stacked image. You can view it with any standard image viewer, e.g.:

ginga Calibrations/Dark_A_1_01.fits

It should resemble any one of your input dark frames aside from:

  • Having been overscan subtracted (depending on the processing parameters)
  • Having been bias subtracted (depending on the processing parameters)
  • Being only a trimmed portion of the image
  • Re-oriented so that vertical is the spectral dimension with blue at the bottom

Trouble Shooting

If your image appears to be in error, here are the things to consider:

  • Is one or more of your input dark frames junk?
  • Is one or more of your input dark frames mis-labeled?

Current DarkImage Data Model

Internally, the image is held in :class:`~pypeit.images.buildimage.DarkImage`, which subclasses from :class:`~pypeit.images.pypeitimage.PypeItImage` and :class:`~pypeit.datamodel.DataContainer`. The datamodel written to disk is: