Bias Subtraction

Overview

Subtracts the bias from the input data.

Class: TBD

Algorithm

The appropriate master bias calibration is subtracted from the input data. The input’s err attribute is updated by adding the dark’s err attribute in quadarature. DQ flags are updated with bitwise or.

Any pixel values in the bias reference data that are set to NaN will have their values reset to zero before being subtracted from the science data, which will effectively skip the bias subtraction operation for those pixels.

Arguments

inputstr | RampModel

The input data to remove the bias from.

biasstr | BiasModel

The name of the bias reference file or a dark model instance. If not provided, the bias is retrieved from the appropriate archive.

Subarrays

The bias is dependent on the detector read mode, therefore subarrays are corrected using the specified read mode.

Calibration Files

• dark