# embed_subs.py: Can be used to embed WFC3 images taken in subarray
# readout mode into a blank full-frame image. Requires the _flt.fits
# and _spt.fits files as input for each image to be processed.
# Wildcards may be used in the input string, e.g. *flt.fits, in order
# to process many files in one run.
#
# A new output _flt.fits file will be created for each input file,
# with the new file having the same rootname as the old, but with the
# final character (often a "q") replaced with the letter "f". The full
# SCI, ERR, DQ structure (for UVIS exposures) and SCI, ERR, DQ, SAMP, TIME
# structure (for IR exposures) is reproduced in the output _flt file.
# The SCI and ERR values for the pixels outside the original subarray
# region will be set to zero, and the DQ values will be set to 4, in
# order to indicate that those pixels should not be used in any subsequent
# processing or analysis.
#
# H. Bushouse (STScI)
# Sept. 2011

To execute this script from within pyraf:
execfile('embed_subs.py')

and execute this script from the OS level (i.e. command prompt):

python embed_subs.py