NAME
bin - compress (bin) image files
SYNOPSIS
bin file bin= [mean] [outfile=] [bitpix=] [debug]
DESCRIPTION
This program shrinks the data file named on the command line by the binning
factor specified.
The binning is done both in rows and columns and the data are summed.
If the mean flag is specified, the
pixel sum is divided by the number of pixels (the square of the binning
factor).
The sum is computed as floating point to keep significance, however,
may be clipped due to the nature of FITS file.
The binned data over-writes the input file unless overriden by the
outfile option.
The bitpix can be changed if desired.
EXAMPLE
bin alflyr bin=4 mean
Compresses the data file alflyr by a factor of 4 (or 16 in total file size).
The pixels are normalized.
BUGS
The FITS header parameters BSCALE, CDELT1 and CDELT2, if they
exist, are not changed.
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