class jwst.dq_init.DQInitStep(name=None, parent=None, config_file=None, _validate_kwds=True, **kws)[source]

Bases: jwst.stpipe.core.JwstStep

Initialize the Data Quality extension from the mask reference file.

The dq_init step initializes the pixeldq attribute of the input datamodel using the MASK reference file. For some FGS exp_types, initialize the dq attribute of the input model instead. The dq attribute of the MASK model is bitwise OR’d with the pixeldq (or dq) attribute of the input model.

Create a Step instance.

  • 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


Methods Summary


Perform the dq_init calibration step

Attributes Documentation

reference_file_types = ['mask']

Methods Documentation


Perform the dq_init calibration step


input (JWST datamodel) – input jwst datamodel


output_model – result JWST datamodel

Return type

JWST datamodel