Source code for jwst.background.subtract_images_step

#! /usr/bin/env python

from ..stpipe import Step
from .. import datamodels
from . import subtract_images

[docs]class SubtractImagesStep(Step): """ SubtractImagesStep: Subtract two exposures from one another to accomplish background subtraction. """ spec = """ """
[docs] def process(self, input1, input2): """ Subtract the background signal from a JWST data model by subtracting a background image from it. Parameters ---------- input1: JWST data model input science data model to be background-subtracted input2: JWST data model background data model Returns ------- result: JWST data model background-subtracted science data model """ # Open the first input model1 = if isinstance(model1, datamodels.CubeModel): self.log.debug('Input is a CubeModel') elif isinstance(model1, datamodels.ImageModel): self.log.debug('Input is an ImageModel') elif isinstance(model1, datamodels.MultiSlitModel): self.log.debug('Input is a MultiSlitModel') # Assume that the second input model is always an ImageModel model2 = datamodels.ImageModel(input2) # Call the subtraction routine result = subtract_images.subtract(model1, model2) # Set the step status indicator in the output model result.meta.cal_step.back_sub = 'COMPLETE' # We're done. Close the models and return the result. model1.close() model2.close() return result