FlatFieldStep

class jwst.flatfield.FlatFieldStep(name=None, parent=None, config_file=None, _validate_kwds=True, **kws)

Bases: jwst.stpipe.core.JwstStep

Flat-field a science image using a flatfield reference image.

correction_pars

After the step has successfully run, the flat field applied is stored.

Type

{‘flat’: DataModel}

use_correction_pars

Use the flat stored in correction_pars

Type

boolean

Create a Step instance.

Parameters

• name (str, optional) – The name of the Step instance. Used in logging messages and in cache filenames. If not provided, one will be generated based on the class name.

• parent (Step instance, optional) – The parent step of this step. Used to determine a fully-qualified name for this step, and to determine the mode in which to run this step.

• config_file (str path, optional) – The path to the config file that this step was initialized with. Use to determine relative path names of other config files.

• **kws (dict) – Additional parameters to set. These will be set as member variables on the new Step instance.

Attributes Summary

flat_suffix
reference_file_types
spec

Methods Summary

process(input)	This is where real work happens.
skip_step(input_model)	Set the calibration switch to SKIPPED.

Attributes Documentation

flat_suffix = 'interpolatedflat'

reference_file_types = ['flat', 'fflat', 'sflat', 'dflat']

spec = '\n        save_interpolated_flat = boolean(default=False) # Save interpolated NRS flat\n        user_supplied_flat = string(default=None)  # User-supplied flat\n        inverse = boolean(default=False)  # Invert the operation\n    '

Methods Documentation

process(input)

This is where real work happens. Every Step subclass has to override this method. The default behaviour is to raise a NotImplementedError exception.

skip_step(input_model)

Set the calibration switch to SKIPPED.

This method makes a copy of input_model, sets the calibration switch for the flat_field step to SKIPPED in the copy, closes input_model, and returns the copy.