mosaic creates a
mosaic image from the ccd fits files of a given exposure. The
output image is a square of size 8192/binning. If not all 8 fits files
are present, or if the files are subrasters, mosaic places the available
images at their correct position within the mosaic
image.
USAGE
mosaic
frame
INPUT
frame
is the set of frames to be mosaiced together
OUTPUT
frame_mos.fits
the mosaic frame
PARAMETERS
none
Details:
The primary purpose of mosaic
is
to assemble the full IMACS camera image, for viewing and manipulation
with
IRAF routines. Note that the assembled image is not astrometrically
accurate, the 8 chip images are placed immediately next to each other,
with
no attention to correct chip offsets and rotations. The coordinate
system
of the mosaiced image is, however, that used by the routines apertures, spectral-lines,
spectral-map,
and adjust-offsets.
The routine display8
also
displays the images of all 8 chips in a IRAF image window, with the
same
orientation and coordinate system. Which routine should you use?
If
your only purpose is viewing the image, and if the image is a
full 8-chip 1x1 binned image, use display 8; mosaic takes additional
time
to run, and fills your disk with additional large files. However, if
you
wish to do anything else with the assembled image (further processing,
or
examining with IRAF routines such as imexam), or it you are working
binned data or with
subrasters, you must use mosaic,
since display8 cannot
handle these, and IRAF routines like imexam need a real file to
work
with.