Data Quality InitializationΒΆ

The DQ initialization step propagates pixel-dependent flags from a static pixel mask reference file into the 2-D DQ array of the science data. The 2-D pixel mask is first translated from the 8-bit DQ array of the reference file into the 32-bit DQ array specified by the master DQ list, then propagated into the 2-D DQ array of the science data file using a bit-wise OR operation.

This link to the JWST pipeline provides detailed information on this step.