Q: The pipeline apparently did not use the optimum calibration
files (or I have to recalibrate because I corrected for
nonlinearity or overflows). Do I have to recalibrate the
data myself?
A: In short, yes. It is really no big deal to recalibrate the
data as long as you can get the appropriate calibration files and
have access to IRAF. You can recalibrate by using CALFOC or
almost as easy and certainly more flexible, by running
individual calibration tasks. The second can be done by
applying foc.focphot.dezoom first if the image was zoomed, then
foc.focgeom.newgeom to apply the geometric calibration, and
then flat field the data with images.imarith or equivalent
(remember to multiply the data with the pipeline UNI file).
Q: I want to apply image restoration techniques to my FOC data.
How come there is no nice, convienient black box program to do
this for me.
A: Due to the many intricacies of FOC data, most notably linearity,
anyone attempting restoration of FOC images needs to become an expert
in both FOC images and restoration techniques. Otherwise,
results of the blind application of a restoration technique may
be based on peculiarities in the FOC image rather than on
actual source structure with no obvious way to tell the
difference.
