NAME
ccdproc - correct ccd images for flat, bias and dark contributions
SYNOPSIS
ccdproc image [nobias] [noflat]
DESCRIPTION
ccdproc corrects the image file by subtracting the bias frame taken
from the DATA_DIR/flats/bias.fts. The bias frame is adjusted for
temperature drift using the BIAS_DRIFT temperature coefficient found in
ait.config. Then the dark contribution is subtracted using the
image DATA_DIR/flats/dark.fts scaled by the exposure time. Finally
it divides the image by a twilight flat field image found in
DATA_DIR/flats/flat$FILTER.fts where FILTER is the name of the filter
used to take the
image.
The symbols ZEROCOR and DARKCOR and FLATCOR are set to 1 if the processing is
completed. The DATID's of the zero, dark and flats are entered into the FITS
header as the BIASID, DARKID and FLATID
respectively.
The script checks whether any of the corrections have been applied, and if
not needed it is
skipped.
SEE ALSO
ait.config,
bias.csh,
dark.csh ,
eveflat.csh ,
photo_proc
BUGS
The HOME_DIR must be specified in the environment. It really should be
derived from the FITS header in the
image.